IceMule Coolers are a highly versatile . leakproof soft cooler that combines the portability of a backpack with the performance of a hard cooler. Now made with new and improved materials and construction this is an everyday cooler designed to be as tough and high-performance as technical outdoor gear that can cost much more. IceMule Coolers feature 4 ways to ensure superior insulation; (1) TriFold DriTop System . foolproof seal to keep ice in and air out . (2) MuleSkinEV Tough Inner and Outer layers; 2X thicker than most soft coolers . (3) PolarLayer Insulation . keeps contents ??IceMule Cold?? for up to 24 hours and (4) IM AirValve . allows for insulation layer air removal so the coller can roll up for storage in its stuff sack. This medium sized cooler measures 12″ diameter x 16″ tall and can hold up to 18 cans plus ice or 6 bottles of wine plus ice. IceMule Coolers the world’s most portable high-performance coolers!