3 liters of storage 1 On/Off zippered tool-pocket 1 main zippered storage. 2.0L Hydration bladder w. Plug-n-Play included NDM 1.2 Harness System, Bounce Free Fit New buckle system (PAT.PEND.) The stretch in the chest straps expands along with the chest during physical exertion, allowing a constant tight and compliant fit. The shoulder straps are ergonomically designed for an even and smooth distribution of the backpack over the shoulders. Pack Weight: approx 400g