Granite Gear Pack Pockets are designed to work with the Granite Gear packs and most other packs on the market. These ultralight pockets with foam backing attach to a pack's side, front or lid compression straps, offering you extra room, protection and convenience. They feature a water-resistant YKK zipper, with the protection of a "garage" that the slider parks in. Constructed of ultralight 70-denier ripstop Hybrid sil-nylon Cordura and 210-denier nylon Cordura.