The Granite Gear Block Rock Solid Compression Sacks evenly compress with out bulging. Made from 210D nylon, the Block Rock Solid Compression Sacks are very durable yet lightweight. This Granite Gear bag features fully finished seams with ultralight microcord and cordlock that contain and compress lofty items like sleeping bags and jackets. Designed to fit more efficiently inside your pack, the new Block Shape fits better into the corners of your pack and stack nicely. Other features include a webbing haul loop, Hypalon grommet, and drawcord closure. The Granite Gear Block Rock Solid Compression Sacks gets even your loftiest items down to a rock solid state.