IceMule Pro Cooler - The Pro Cooler from IceMule is the world's most portable high-capacity cooler! It perfectly combines the portability of a backpack with the leak-proof, ice-keeping performance of a hard cooler. Made of an extremely durable 1000D tarpaulin fabric on the outside, abrasion resistant vinyl on the inside, and seams rated to 65 pounds this cooler can handle it all. The PolarLayer insulation keeps ice intact and contents "IceMule Cold" for up to 24 hours. Reinforced back-straps and ventilated back pads provide ultimate comfort for long-range excursions. The TriFold DriTop System ensures a foolproof seal to keep ice in and air out. The IM AirValve allows for air removal in the insulation layer so the cooler can be roll up for storage in its stuff sack when not in use. The IceMule Pro Cooler is a serious cooler designed for extreme adventure.... or, when you just have a lot of stuff that you need to keep cold!