Usage: Approximately 2 hours per session. An external bag that can expand the capacity of the Beta Light by 4 liters. Attaches with a wire clip to the chest strap or the front mesh pocket. Can be fixed to the hip belt of the Beta Light body, or used as a waist bag on its own. Elastic carry for securing Z-poles. Internal mesh zipper pocket / key clip. Capacity: 4 liters Material: 100D 4mm ripstop nylon Weight: 145g