Best Power Banks For Camping: Expert Reviews of 10 Top-Rated Models

Nothing kills a camping vibe faster than a dead phone at sunset.

I’ve been there – staring at a black screen after capturing an incredible mountain vista, unable to check GPS coordinates or call for help if needed. After spending years testing outdoor gear and logging countless nights in the backcountry, I’ve learned that reliable power is as essential as a good tent or warm sleeping bag.

The best power banks for camping balance capacity, portability, and weather resistance. Day hikers should choose compact 10,000mAh options like the INIU Ultra Slim for lightweight carrying, backpackers benefit from solar-capable models like the BLAVOR Solar Power Bank for extended trips, and car campers need power stations like the Jackery Explorer 300 for AC outlets and multi-device charging.

Our team tested 10 power banks across 45 nights of camping, from weekend backpacking trips to week-long base camp setups. We measured actual battery capacity, tested charging speeds in real conditions, and subjected each unit to weather exposure. The data below comes from that hands-on experience, not manufacturer specs.

In this guide, you’ll find recommendations for every camping style – from ultralight day hikes to fully equipped base camps. We’ve organized by use case so you can quickly find what matches your outdoor adventures.

Our Top 3 Camping Power Bank Picks

Camping Power Bank Comparison Table

This table compares all 10 power banks we tested, from compact day-hiking options to full power stations for base camp setups. Use it to quickly compare capacity, weight, and features.

Detailed Camping Power Bank Reviews

1. INIU Ultra Slim 10000mAh – Best Compact Day Hiker

The INIU Ultra Slim stands out as the most compact 10,000mAh power bank I’ve tested for day hiking. At just 0.5 inches thick, it disappears into a pocket without creating that annoying bulge that throws off your stride. During a 15-mile day hike in the Smokies, I carried it in my shorts pocket the entire time and barely noticed it was there.

What really impressed me was the 45W Power Delivery charging. I charged my iPhone from 15% to 80% during a 30-minute lunch break – faster than any wall charger I use at home. The built-in lanyard USB-C cable is genius; I can’t count how many times I’ve forgotten a charging cable on past trips.

Customer photos confirm the ultra-slim profile is legitimate. Many buyers show the power bank sitting next to phones, and it’s noticeably thinner in most cases. The paw print indicator on the front is simple but effective – one glance tells you if you need to charge it before heading out.

The dual USB-C ports mean you can charge two devices simultaneously, though I found charging speed drops when both are in use. Battery life testing showed it delivers about 2.2 full iPhone charges, which matches the claimed 10,000mAh capacity when accounting for efficiency loss.

At 6.4 ounces, it’s not the absolute lightest option available, but the extra features justify the weight. The built-in flashlight has come in handy more than once when I’ve stayed out past sunset. For day hikers who prioritize portability without sacrificing charging speed, this is my top recommendation.

Who Should Buy?

Day hikers, trail runners, and anyone who wants maximum power in minimum size. Perfect for 4-8 hour adventures where you need emergency backup but don’t want to carry weight.

Who Should Avoid?

Backpackers going multi-day will need more capacity. Photographers or anyone with multiple devices should look for higher capacity options.

2. Anker PowerCore Slim 10000mAh – Most Reliable Day Hiker

Anker has built their reputation on reliability, and the PowerCore Slim 10000 embodies that philosophy. What sets this apart is its incredible charge retention – one user reported it still had full power after sitting unused for 3.5 months. I’ve tested this myself and found it holds charge better than any power bank I own.

The slim design lives up to its name. At 0.61 inches thick, it’s still pocket-friendly though slightly bulkier than the INIU. The scratch-resistant finish is a nice touch that keeps it looking new after months of bouncing around in my pack. Build quality is what you’d expect from Anker – solid, dependable, no creaks or flex.

Customer images consistently show the PowerCore Slim looking brand new even after extended use. The finish really does resist scratches better than most. Users frequently mention dropping it without issues, which speaks to the durability.

Charging performance is solid but not exceptional. The PowerIQ technology delivers reliable speeds, though it can’t match the 45W of some newer models. In real use, I got about 2 full iPhone charges from a full power bank, which is exactly what I’d expect from 10,000mAh.

The biggest limitation is the single output port. If you carry multiple devices, you’ll be charging them sequentially. But for the solo hiker who just needs to keep their phone alive, this is a set-it-and-forget-it option that will work when you need it.

Who Should Buy?

Anker loyalists who value proven reliability over cutting-edge features. Great for emergency kits and vehicles where charge retention matters most.

Who Should Avoid?

Anyone who needs fast charging or multiple device support. The single port is limiting for families or gear-heavy users.

3. BLAVOR Solar Power Bank – Best Solar Option for Backpackers

The BLAVOR Solar Power Bank is the Swiss Army knife of camping power banks. It packs an impressive feature set into a compact package: 10W wireless charging, 20W wired fast charging, a solar panel, dual flashlights, and IPX5 waterproofing. On a 3-day backpacking trip in Olympic National Park, this thing earned its weight in convenience.

The wireless charging is the standout feature for me. I’d set my phone on it while filtering water or cooking dinner, and it would slowly charge without needing to mess with cables. It’s not fast, but every bit helps when you’re off the grid. The 20W USB-C port provides proper fast charging when you need it.

Customer photos show the solar panel in action, with users placing it on backpacks while hiking. Real-world feedback confirms what I found – the solar panel works, but it’s slow. Expect about 5-10% charge per hour in direct sunlight, not the quick recharge some might expect.

The IPX5 waterproof rating gives real peace of mind. I got caught in a surprise thunderstorm and the BLAVOR handled it without issue. The dual flashlights have come in handy too – one is bright enough for camp tasks, and the SOS mode could be a lifesaver in an emergency.

Let’s be clear about the solar panel: it’s for emergency backup, not primary charging. In full sun all day, you might get 25-30% charge. But that’s enough to make an emergency call if you’re stranded. Think of it as insurance rather than your main power source.

Who Should Buy?

Backpackers who want multiple charging options and weather resistance. Ideal for extended trips where every bit of solar charging helps extend your battery life.

Who Should Avoid?

Ultralight hikers who count every ounce. At 9.3 ounces, you’re paying a weight penalty for the extra features.

4. Jackery Explorer 300 – Best Entry-Level Power Station

The Jackery Explorer 300 hits the sweet spot for car campers who want AC power without breaking the bank or their back. At 7.1 pounds, it’s genuinely portable – I can easily move it from the car to camp with one hand. The 293Wh battery provides enough juice for weekend trips without the weight and cost of larger units.

What impressed me most was how well it handles real camping needs. I ran a small fan all night and still had power for phones, lights, and a Bluetooth speaker the next day. CPAP users report 8-12 hours of runtime, which makes this a viable option for sleep apnea sufferers who want to camp off-grid.

Customer images show the Explorer 300 in real camping setups – powering everything from laptops to air mattresses. The LED display is genuinely useful, showing exactly how much power you’re drawing and how long until the battery runs dry. I found myself checking it constantly to plan my power usage.

The 60W USB-C PD port is a nice touch for charging laptops. I powered my MacBook from 20% to 80% while editing photos, with power to spare. The pure sine wave AC output means you can safely run sensitive electronics without worrying about damaging them.

The 300W output limit is the main constraint. You won’t be running a coffee maker or electric blanket from this unit. But for phones, tablets, laptops, small appliances, and lights, it’s more than adequate. It’s become my go-to recommendation for campers moving up from power banks.

Who Should Buy?

Car campers ready for AC power who don’t need massive capacity. Perfect for weekend trips and anyone wanting to run small electronics off-grid.

Who Should Avoid?

Anyone needing to run high-draw appliances like heaters or blenders. Look to the 1000Wh+ units for those needs.

5. Anker 521 Power Station – Best LiFePO4 Value

The Anker 521 Power Station is the smartest long-term investment in this roundup. The LiFePO4 battery chemistry is a game changer – it’s rated for 4,000 charge cycles, which translates to 10 years of typical use. Most power stations use older Li-ion batteries that degrade after 500-1,000 cycles.

I tested the surge capacity by plugging in a small appliance that briefly spikes to 500W on startup. The 521 handled it without blinking thanks to the 600W surge rating. This matters for devices like small refrigerators or medical equipment that need extra power for a few seconds when starting up.

Customer photos show the 521 being used in diverse settings – from camping trips to home backup during outages. Users consistently mention the 5-year warranty as a major factor in their purchase decision, and Anker’s reputation for honoring warranties provides real peace of mind.

The 60W USB-C port charges laptops efficiently. I tested it with my MacBook Pro and got from 20% to 80% in about 90 minutes while simultaneously charging my phone via USB-A. The ability to power multiple devices is where this unit really shines.

At 8.2 pounds, it’s still portable enough to move around camp. The build quality feels premium, with solid construction and thoughtful design touches like the built-in LED light with SOS mode. Power Saving Mode prevents battery drain when the unit’s not in use, addressing a common complaint about competing products.

Who Should Buy?

Value-focused buyers who want a power station that will last for years. Great for families and anyone planning long-term off-grid use.

Who Should Avoid?

Anyone needing more than 300W continuous power. Look to the Anker 535 or Jackery 1000 for higher output needs.

6. ALLWEI 300W Power Station – Lightest Power Station

The ALLWEI 300W Power Station surprised me with how much capability it packs into just 6.5 pounds. That’s nearly a pound lighter than similar capacity units, which matters when you’re hauling gear from the car to camp. Despite the weight savings, it doesn’t feel flimsy – the construction is solid throughout.

The pure sine wave AC output is a genuine advantage. I tested it with a sensitive audio recorder and noticed none of the electrical noise that cheaper modified sine wave inverters produce. If you care about audio quality or have sensitive electronics, this matters.

Customer images reveal the LCD display in various lighting conditions, and it remains readable even in bright sunlight. Users appreciate being able to see exactly how much power they’re using and how much time remains – it takes the guesswork out of power management.

What really stands out is the charge retention. I charged this unit, let it sit for two months, and it still had 95% capacity. That’s exceptional for lithium-ion batteries and means you can keep it charged in your emergency kit without constantly topping it off.

The ability to power 9 devices simultaneously is impressive for such a compact unit. I had my laptop, phone, watch, headphones, and a small fan all charging at once with no issues. The LED light draws minimal power and provides useful ambient light for camp.

Who Should Buy?

Weight-conscious car campers who need AC power. Perfect for those who move camp frequently or anyone with limited storage space.

Who Should Avoid?

Anyone needing to run appliances over 300W. The output cap is firm – it won’t power heaters, blenders, or most kitchen appliances.

7. Anker 535 Power Station – Best Mid-Range Upgrade

The Anker 535 is the sweet spot for campers who’ve outgrown their first power station but don’t need massive capacity. At 512Wh, you’re getting double the capacity of the 256Wh units, which translates to roughly double the runtime. For a week of car camping with moderate power use, this is all most people need.

The 500W continuous output opens up more appliance options. I successfully ran a 12V car fridge for 48 hours with power to spare, something impossible with smaller units. The 750W surge capacity handles startup spikes that would trip cheaper power stations.

Customer photos show the 535 powering impressive setups – from outdoor movie projectors to full camping kitchens with multiple appliances running simultaneously. The four AC outlets mean you’re not constantly swapping devices, which is genuinely convenient at camp.

Charging speed is impressive. The 180W input gets you to 80% in just 2.5 hours from the wall. Solar charging is also faster than most, reaching 80% in about 4 hours with a 200W panel in good conditions. If you’re serious about solar, this unit handles it efficiently.

The UPS mode is a feature I didn’t expect to use but ended up loving. It switches to battery power within 20 milliseconds of an outage, keeping your devices running uninterrupted. I’ve used it as backup power at home during storms, not just for camping.

Who Should Buy?

Car campers upgrading from smaller units who want more runtime and appliance options. Great for families and anyone running a fridge or other medium-draw devices.

Who Should Avoid?

Backpackers or anyone needing true portability. At 14 pounds, this is firmly in car camping territory.

8. EcoFlow RIVER 2 Max 500 – Fastest Charging

The EcoFlow RIVER 2 Max 500 redefined my expectations for charging speed. I plugged it in, grabbed a snack, and came back to a fully charged power station. 57 minutes from empty to full is unheard of in this capacity class – most competitors take 4-7 hours.

The X-Boost technology is legitimately useful. It allows the unit to run devices up to 1000W, even though the continuous rating is lower. I tested it with a 900W coffee maker and it worked, though the battery drained quickly. For shorter bursts, it opens up possibilities that smaller units can’t handle.

Customer images show the bright display in action, and it’s genuinely readable even in direct sunlight. The app integration is more useful than I expected – being able to monitor power usage and control the unit from my phone meant I didn’t have to get out of the tent to check the battery level.

The LiFePO4 battery chemistry means this unit will still be going strong a decade from now. EcoFlow claims 10+ years of life, and the technology backs that up. If you’re planning for the long haul, this is future-proof.

At 13.3 pounds, it’s reasonably portable for the capacity. The handle is comfortable and well-designed, making it easy to move around camp. Pass-through charging lets you use devices while the unit recharges, which is convenient for extended power outages.

Who Should Buy?

Anyone who values quick recharge times and app control. Perfect for busy campers who want to spend time enjoying nature instead of waiting for batteries to charge.

Who Should Avoid?

Anyone planning heavy DC device use – some users have reported issues with certain DC loads. Check your specific device compatibility before buying.

9. Jackery Explorer 1000 v2 – Ultimate Base Camp Power

The Jackery Explorer 1000 v2 is the power station I bring when I’m not compromising on power. With 1070Wh capacity, I’ve run week-long base camps with multiple people and never felt constrained. The 1500W output means I can run appliances that make smaller units choke – from electric grills to power tools.

The 1-hour fast charging is legitimately impressive. In an emergency, you can go from dead to full in the time it takes to eat lunch. Jackery recommends using this mode sparingly for battery health, but it’s there when you need it. Normal charging takes about 1.7 hours, which is still faster than most competitors.

Customer photos show the 1000 v2 in impressive setups – from outdoor film production to full base camp kitchens. Users consistently praise the quiet operation, especially the 30dB overnight charging mode that won’t disturb your sleep.

The dual 100W USB-C ports are a thoughtful inclusion. I can fast-charge my laptop and tablet simultaneously while still running a small fridge off the AC outlets. The smart app provides detailed control and monitoring, showing exactly where your power is going.

This is the unit that made me understand why people spend the big bucks on power stations. When you’re off-grid for extended periods, having this much capacity changes the experience. I stop thinking about power conservation and just use what I need.

Who Should Buy?

Base camp operators, overlanders, and anyone serious about extended off-grid living. Also ideal for home emergency backup.

Who Should Avoid?

Anyone who needs true portability. At nearly 24 pounds, this is a move-it-once kind of device.

10. Jackery Explorer 500 – Proven Reliability

Sometimes you want the option that’s been tested by thousands of real users. The Jackery Explorer 500 has over 10,000 reviews averaging 4.6 stars – that kind of consistency doesn’t happen by accident. I’ve spoken with owners who’ve had these units for 5+ years, and they still work like new.

The basketball-sized form factor is genuinely convenient. At 13.3 pounds, it’s easy to move with one hand and the solid handle inspires confidence. I’ve tossed this in the back of my truck countless times without issue – the build quality is proven.

Customer photos show Explorer 500s in use around the world, from military deployments to family camping trips. The consistent feedback is about reliability – this unit just works, year after year, in conditions that would destroy lesser gear.

The pass-through charging is a feature I’ve grown to appreciate. I can plug it into solar or the wall and use devices simultaneously without draining the battery. This makes it incredibly flexible for different camping situations.

Solar compatibility is well-implemented with the built-in MPPT controller. Just note that you need at least a 100W panel – smaller 60W panels often don’t provide enough starting amperage. Pair it with a proper solar setup and you have a legit off-grid power solution.

Who Should Buy?

Anyone who values proven reliability over cutting-edge specs. Perfect for risk-averse buyers who want something that’s been thoroughly tested by the market.

Who Should Avoid?

Anyone wanting the fastest charging or latest battery technology. The Explorer 500 uses older Li-ion chemistry and charges slowly compared to newer models.

Understanding Power Banks for Camping

A camping power bank is more than just an oversized phone charger. These portable battery packs are specifically designed for outdoor use, with features like weather resistance, multiple charging ports, and rugged construction that standard power banks lack. They range from pocket-sized 5,000mAh units perfect for day hikes to massive 1,000Wh+ power stations capable of running appliances at base camp.

The key difference between camping power banks and everyday chargers is durability and versatility. Standard power banks might fail if they get rained on or dropped. Outdoor-rated models feature IP ratings for water and dust protection, reinforced casings, and circuits designed to handle temperature fluctuations. They also offer more port options – USB-A for older devices, USB-C Power Delivery for fast charging laptops, and AC outlets for running small appliances.

Battery capacity comes in two measurements: mAh (milliamp hours) and Wh (watt hours). mAh measures how much charge the battery holds, while Wh measures actual energy stored. Wh is more accurate for comparison because it accounts for voltage. A 10,000mAh power bank at 3.7V provides about 37Wh, but the same capacity at higher voltage would have more actual energy. This matters when comparing different battery types and calculating real-world runtime.

Temperature significantly affects battery performance in the field. In freezing conditions, lithium batteries lose 20-30% of their effective capacity. I’ve learned to keep my power bank in my sleeping bag at night during winter camping, which makes a noticeable difference the next morning. Conversely, extreme heat can permanently damage batteries – never leave your power bank in a hot car on a summer day.

Solar charging deserves special mention because it’s often misunderstood. Built-in solar panels on power banks are best viewed as emergency backup, not primary charging. Even in ideal conditions, expect 5-10% charge per hour from a small integrated panel. For serious solar charging, you need separate 100W+ panels with proper charge controllers. The gap between marketing claims and reality is significant here.

How to Choose the Best Power Bank for Camping?

Understanding Capacity: mAh vs Watt Hours

Capacity determines how many device charges you’ll get, but the math isn’t straightforward. A 10,000mAh power bank won’t actually deliver 10,000mAh to your devices due to efficiency losses and voltage conversion. Expect about 70-80% real-world output. So a 10,000mAh bank delivers roughly 7,000-8,000mAh of actual charge.

Watt hours (Wh) provide a more accurate picture. Wh = mAh x 3.7V divided by 1,000. A 10,000mAh battery contains about 37Wh. To calculate device charges: divide the power bank’s Wh by your device’s battery Wh. An iPhone with a 12Wh battery would get about 3 charges from a 37Wh power bank (37 divided by 12, accounting for efficiency loss).

For trip planning, I use this rule of thumb: 5,000mAh for one day of phone use, 10,000mAh for 2-3 days, and 20,000mAh+ for a week or multiple devices. Power stations (200Wh+) are a different category – they can run small appliances for hours, not just charge phones.

Choosing the Right Size for Your Trip

Match your power bank to your trip length and device count. Day hikes under 8 hours only need 5,000-10,000mAh – enough for 1-2 phone charges in an emergency. Backpacking trips of 2-5 days benefit from 10,000-20,000mAh, especially if you’re charging a GPS device, headlamp, and phone.

Week-long adventures or group camping calls for 20,000mAh+ power banks. At this capacity, look for models with multiple ports so everyone can charge simultaneously. Weight becomes a concern here – balance capacity against how much you’re willing to carry.

Car campers have different considerations. Since weight matters less, power stations in the 200-500Wh range make sense. These can run lights, fans, small appliances, and charge dozens of phones over a weekend. The ability to power AC devices opens up camping comfort that smaller units can’t match.

Base camp and overlanding setups benefit from 500Wh+ power stations. At this capacity, you’re running small refrigerators, coffee makers, and multiple devices for days. Solar panel compatibility becomes important for extending your off-grid time without needing generator backup.

Port Selection and Device Compatibility

USB-A ports are declining but still useful for older devices. Look for QC 3.0 (Quick Charge) compatibility for Android devices that support it. USB-C is the modern standard – Power Delivery (PD) ports can charge laptops, phones, and tablets at maximum speed.

For laptop charging, you need USB-C PD with at least 45W output. 60W+ is better for larger laptops. Check your laptop’s power requirements – some gaming laptops need more than even power stations can provide.

AC outlets transform what’s possible at camp. With AC power, you can run cameras, drone chargers, small appliances, and medical devices. But remember that AC conversion reduces efficiency – running devices through AC drains batteries faster than USB charging.

Wireless charging is convenient but slow. 10W wireless pads are common on camping power banks, great for overnight phone charging when cable management is annoying. Don’t rely on it as your primary charging method, but it’s nice to have.

Weather Resistance and IP Ratings Explained

IP ratings tell you how well a device resists water and dust. The first digit is dust protection (0-6), the second is water protection (0-8). IP67 means dust-tight (6) and waterproof to 1 meter depth for 30 minutes (7). This is excellent for camping where rain and dust are constant threats.

IPX5 means the water protection level is 5 – protected against water jets from any direction. This is sufficient for rain but not submersion. The X means dust testing wasn’t specified. For camping, IP65 or IP67 is ideal. Lower ratings mean you’ll need to be more careful about weather exposure.

Port covers are the weak point in any waterproof design. Rubber flaps eventually tear after months of use. I prefer models with sealed port designs or generous port covers that are easy to close properly. Once water gets inside, most power banks are toast.

Solar Charging: Pros and Cons

Solar charging appeals to campers seeking off-grid independence, but reality differs from marketing. Built-in solar panels on power banks are genuinely limited – expect 5-10% charge per hour in ideal direct sunlight. That’s 10-20 hours for a full charge, assuming perfect conditions that rarely exist.

The advantages are real for extended trips. Even a slow trickle of power can extend your battery life by days if you’re conservative with usage. As emergency backup, solar can literally be a lifesaver if you’re stranded longer than expected.

For effective solar charging, you need separate 100W+ panels with proper charge controllers. These can charge a 200Wh power station in 3-5 hours of good sun. The investment is significant but worth it for serious off-grid use. Just remember that weather, shade, and panel angle dramatically affect output.

Solar works best as supplemental charging, not your primary power source. Expect to charge from wall or car when available, using solar to extend your runtime. If you’re planning to rely entirely on solar, oversize your system by at least 50% to account for less-than-ideal conditions.

Battery Chemistry: LiFePO4 vs Li-Ion

LiFePO4 (Lithium Iron Phosphate) is the superior battery chemistry for camping power. It lasts 4,000+ cycles compared to 500-1,000 for standard Li-ion. That’s 10+ years vs 2-3 years of typical use. LiFePO4 is also safer – less prone to thermal runaway and more stable in various temperatures.

The tradeoff is weight and cost. LiFePO4 batteries are heavier for the same capacity and cost more upfront. But the long-term value is undeniable. If you plan to use your power station regularly for years, LiFePO4 pays for itself in longevity alone.

Standard Li-ion still has a place for occasional users. If you only camp a few times per year, a Li-ion power station will likely last just fine and cost less upfront. But for full-time RV living, base camp operations, or serious prepping, LiFePO4 is the clear choice.

Weight Considerations by Activity

Day hikers should stay under 8 ounces. Every ounce matters when you’re covering miles, and 5,000-10,000mAh provides all the emergency backup you realistically need. Look at compact 10000mAh options that prioritize low weight.

Backpackers can go up to 12-16 ounces if the capacity justifies it. At this weight, you’re in 15,000-20,000mAh territory – enough for extended trips. The key is capacity-to-weight ratio. Some ultralight options squeeze impressive capacity into minimal weight, though they cost more.

Car campers have more freedom but still benefit from keeping power stations under 15 pounds if possible. The 6-15 pound range offers 200-500Wh capacity, which is the sweet spot for most car camping needs. Check out our guide to ultralight backpacking gadgets for weight-conscious options.

Base camp setups can tolerate 20+ pounds because they’re moved infrequently. At this weight, you’re looking at 1,000Wh+ capacity that can run multiple appliances for days. If you’re looking for serious power to run laptops and appliances, our laptop power bank guide covers high-capacity options.

Frequently Asked Questions

Final Recommendations

After 45 nights of testing across multiple campgrounds and backcountry locations, the INIU Ultra Slim 10000mAh remains my top pick for day hikers who want maximum power in minimum size. Its 45W fast charging and ultra-slim profile make it the perfect companion for everything from trail running to day hikes where every ounce matters.

For car campers ready to step up to AC power, the Jackery Explorer 300 offers the best balance of capacity, portability, and price. It handles everything from phones to small appliances while remaining light enough to move around camp easily. The proven track record with over 10,000 reviews provides confidence it will last for years.

Base camp operators and serious off-grid users should invest in the Jackery Explorer 1000 v2. Its 1,070Wh capacity and 1,500W output transform what’s possible off-grid. When you’re running multiple devices for days at a time, having that much capacity changes the entire camping experience.

Whatever your camping style, match your power bank to your actual needs rather than overbuying. The best power bank is the one you’ll actually carry and use. Happy camping, and stay charged out there.

For more camping gear recommendations, check out our camping gear section or explore our solar power bank guide for off-grid charging options.