Exploring
The SPARTER Backpack Cooler is the best backpack cooler for most people — leak-proof, 33 to 49 cans, and backed by nearly 11,000 owner reviews. The Hulongo 30L Waterproof is the rugged pick for wet work, and the Hydro Flask Carryout is the premium soft cooler that holds ice longest.
How We Picked
We compared insulation performance and realistic ice retention, leak-proof construction (the failure everyone discovers on the drive home), capacity in cans and liters, strap and back-panel comfort under a full load, and durability across thousands of owner reports. A soft backpack cooler is the portable end of a bigger system — for cold storage that stays put, see our 12V refrigerator picks and our chest freezer guide.
1. Best Overall: SPARTER Insulated Leak-Proof Backpack Cooler, 33/49 Cans
SPARTER Insulated Leak-Proof Backpack Cooler, 33/49 Cans
SPARTER
- Holds 33 or 49 cans depending on size
- Leak-proof liner survives melted ice on the drive home
- Padded shoulder straps and back panel for loaded carries
- Front pocket and side pockets for dry goods
- One of the most-reviewed coolers of any type on Amazon
- 4.5★ from 10,800+ owners
Why we picked it: Almost eleven thousand ratings at 4.5 stars is the kind of evidence you rarely get in this category, and it points at the thing that matters most in a soft cooler: the liner doesn't leak. Cheap backpack coolers seep meltwater into the back panel and then into your shirt, which is how most of them end up in a garage. The SPARTER holds a serious load, carries comfortably when full, and has the pockets to keep dry food away from the ice.
2. Best Waterproof: Hulongo Large Waterproof Insulated Cooler Backpack, 30L, 48 Cans
Hulongo Large Waterproof Insulated Cooler Backpack, 30L, 48 Cans
Hulongo
- Fully waterproof shell, not just water-resistant
- 30 litres holds up to 48 cans
- Wipes clean after muddy or fishy work
- Handles rain, boat spray, and creek crossings
- Reinforced construction for rough hauling
- 4.4★ from 2,100+ owners, 3,000+ bought in the past month
Why we picked it: Water-resistant means it survives a shower; waterproof means it survives being set down in a creek. If you're hauling a catch, working in the rain, or loading a boat, the difference matters — and a shell you can hose off afterwards adds years to the bag's life. At 30 litres it's the biggest of the three, and 3,000+ sales a month suggests plenty of people are finding it holds up to exactly this kind of use.
3. Best Premium: Hydro Flask Carryout Insulated Portable Soft Cooler
Hydro Flask Carryout Insulated Portable Soft Cooler
Hydro Flask
- Hydro Flask insulation holds ice notably longer
- Welded, leak-proof seam construction
- Built to the same standard as the brand's bottles
- Comfortable carry with a structured, stable body
- Backed by a serious brand warranty
- 4.7★ from 1,100+ owners
Why we picked it: In a soft cooler, insulation thickness and seam quality are the whole game, and this is where a premium brand actually earns the difference. Hydro Flask's welded seams and denser insulation buy you hours of extra ice on a hot day — which is the margin between cold food at 4pm and a warm sandwich you don't want. It's the highest-rated of the three and the one to buy if you're regularly out from dawn to dusk in real heat.
Comparison Table
| Pick | Cooler | Capacity | Standout | Best for |
|---|---|---|---|---|
| Best Overall | SPARTER Backpack Cooler | 33-49 cans | Leak-proof liner | Everyday camping and hauling |
| Best Waterproof | Hulongo 30L Waterproof | 30L / 48 cans | Waterproof shell | Wet and dirty conditions |
| Best Premium | Hydro Flask Carryout Cooler | Soft cooler | Longest ice retention | Hot climates and long days |
What to Look For in a Backpack Cooler
Leak-proof beats water-resistant. Every cooler eventually holds melted ice, and the seams are where it escapes. Look for welded or heat-sealed seams rather than stitched ones — stitching creates thousands of tiny holes by definition. This is the single most common complaint about cheap backpack coolers and the easiest thing to check before buying.
Capacity in cans, and what else you're carrying. Can counts assume the bag is full of cans and nothing else. Real loads include a block of ice, some containers, and awkward shapes, so a 30-can bag realistically carries food for two people for a day. Size up if you're feeding a group or planning an overnight.
Carry comfort matters more as capacity grows. A 48-can cooler full of ice is heavy — comfortably over 30 pounds. Padded shoulder straps, a ventilated back panel, and a chest or sternum strap turn that from a chore into a normal pack carry. Straps are where the cheapest bags cut costs, and it shows within the first quarter mile.
Ice strategy changes your results more than the bag does. Pre-chill the cooler overnight, use block ice rather than cubes where you can, fill empty space with more cold rather than air, and keep it out of direct sun. Any decent backpack cooler managed this way will outperform a premium one that was packed warm and left on hot gravel.
Soft cooler vs. hard cooler. A backpack cooler wins on portability and loses on ice retention — a hard cooler with thick walls will always hold cold longer. Use the backpack for the day trip and the walk-in, and keep a hard cooler or a 12V fridge at camp for the food that has to survive the whole weekend.
Bottom Line: Which Should You Buy?
For most people: the SPARTER Backpack Cooler. Leak-proof, comfortable loaded, and vetted by nearly 11,000 owners.
For wet and dirty work: the Hulongo 30L Waterproof. A truly waterproof shell you can hose out at the end of the day.
For long, hot days: the Hydro Flask Carryout Cooler. The best ice retention here, with the build quality to match.
Ready to buy?
Jump straight to our top picks on Amazon — prices shown at click-through.
Frequently Asked Questions
How long do backpack coolers keep ice?
Realistically 12 to 24 hours for most soft backpack coolers, with premium models pushing toward 36 in good conditions. That's well short of a thick-walled hard cooler, which is the trade-off for carrying it on your back. Pre-chilling the bag and using block ice makes a bigger difference than most people expect.
Are backpack coolers waterproof?
Most are leak-proof on the inside — meaning melted ice stays in — but only some are waterproof on the outside. If you're going to set the bag down in wet grass, load it on a boat, or work in rain, look specifically for a waterproof shell rather than a water-resistant one.
What size backpack cooler do I need?
For a day trip for one or two people, 20-30 cans is plenty. For a family day out or an overnight, look at 40-50 cans. Remember that ice takes up roughly a third of the usable volume, so the number on the box is not the amount of food you'll fit.
Can you use dry ice in a backpack cooler?
Generally no. Dry ice sits at -109°F and can damage soft cooler liners and seams, and a sealed soft cooler creates a carbon dioxide buildup risk as it sublimates. Stick to regular ice or reusable gel packs unless the manufacturer specifically approves dry ice.
How do you clean a backpack cooler?
Empty it immediately after use, wipe the interior with warm soapy water, then rinse and leave it fully open to air dry — trapped moisture is what causes the smell people blame on the cooler itself. For stubborn odors, wipe the liner with a dilute vinegar or baking soda solution and dry it completely before storing.
Related Guides
How We Research
Picks are based on manufacturer specifications, current Amazon availability, and patterns across verified owner reviews. Ice retention varies widely with ambient temperature, pre-chilling, and how full the cooler is packed — treat manufacturer claims as best-case figures.
Safety note: Perishable food should not stay above 40°F for more than two hours, or one hour above 90°F. Keep a thermometer in the cooler on long outings rather than guessing, and discard anything that has warmed past that window.