The MetaMorph Canyon Pack is designed for a long approach or quick afternoon jaunt. Full capacity is 44+1L and it can roll down to a compact 35L. This pack can adapt to your needs. It has a built in external pockets for a helmet, gear or snacks. The lid is removable and has a small pocket inside. Speaking of the insides, the pack has an internal mesh pocket and gear loops to keep you pack in order. It is constructed of 900D TPU (thermoplastic polyurethane) making it flexible, durable, and with excellent tensile strength. The main body is dual layered with ample holes for drainage