Internal Capacity: Best in class 3.5 gallons, 14.25 quarts Water and leak proof Performance: Maintains cold retention for days with proper ice packing. Outer textile: SPEC-OPS 840 Denier double TPU Inner textile: SPEC-OPS 210 Denier double TPU, FDA food grade, BPA-free and anti-microbial. Insulated inner walls: 28mm of tough META- POLYMER closed cell foam and EVA reinforcement in the lid, base and back, which provides additional insulation, structure and protection. Zipper: German TIZIP Master Seal#10, water proof Craftsmanship: Ultrasonic RF Welding as used in whitewater craft. Convenience: Exclusive flip top eliminates zipper abrasion