Like all of Yeti’s overbuilt coolers, the Hopper Flip 12 offers bombproof construction to endure years of hard use & abuse. The exterior is made of tough TPU-laminated nylon & features a watertight, airtight Hydrolok zipper plus a removable shoulder strap & MOLLE webbing for attaching gear. The interior lining is a food-grade anti-microbial material. At 3.2-gallon capacity, it is sized for packing a family picnic or toting a 12-pack.