Get a rotomolded soft cooler with a waterproof zipper.

Yeti Hopper or Engel Deep Blue. Pick one. Yes, they’re expensive. No, you won’t find a cheaper option that stays truly leakproof after a few trips.

The key is the zipper. Cheap soft coolers use a standard zipper and rely on a flimsy flap to keep water out. That fails fast. A proper waterproof zipper (like Yeti’s “HydroShield” or Engel’s dry dock design) seals tight. Combined with rotomolded construction, you get a cooler that can take a beating and won’t leak when you flip your kayak or drop it on a rock.

Insulation matters too, but for kayaking, leakproof is priority one. You don’t want soggy sandwiches.