IceMule Pro Cooler - X LG (30L) - Realtree Camo (Xtra pattern) Foolproof seal to keep ice in and air out. Tough 1000 denier Outer layer for exceptional strength and durability; heavy-duty inner layer 2X thicker than most soft coolers. Reinforced back-straps and plus ventilated back pads provide ultimate comfort for long-range excursions. PolarLayer Insulation keeps ice intact and contents IceMule Cold for up to 24 hours. IM AirValve allows for insulation layer air removal so the coller can roll up for storage in its stuff sack.