Weight: 9.9 oz. with Reservoir (5.6 oz (0.16 kg) without Reservoir) * Gear Storage: 25 cubic inches (0.4 L) * Reversible Reservoir: 32 oz (1.0 L) Elite Plug-N-Play * Soft Moisture Wicking Back panel holds 1 liter Reversible Reservoir (included) * 4 Integrated Holster-style pockets and 2 Expandable Front Zippered Pocket (iPhone Compatible)