The Pack Pocket by Granite Gear. Granite Gear Pack Pockets are designed to work with our 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.