Granite Gear shoulder strap pockets work with their packs and most other packs on the market. These foam padded, ultralight pockets attach to a pack's load lifter webbing at the top and lower adjustment buckle web at the bottom. They offer extra room, protection and convenience for the items you need close at hand while you're on the trail. On the back is a port for your headphone, ear bud or headset cord. The fabrics are ultralight 70 denier ripstop hybrid sil nylon Cordura and 210 denier nylon Cordura, and the zipper is a water resistant YKK. Works on both right and left shoulder straps and includes a free 24 grey web accessory strap.