Hydrapak Hydration E-Lite Vest, 32-Ounce 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)