Reservoir Included - Comes with an Osprey Hydraulics LT 2.5 L reservoir, dedicated sleeve and sternum strap magnetic bite valve attachment. Hydraulics Quick Connect sold separately Airscape Suspension - Die-cut foam AirScape backpanel creates a breathable, close-to-body fit Classic Design - Simple rucksack design with bucket style top-zip access makes for easy loading Body-Specific Fit - Skarab/Skimmer is designed to provide a body-specific fit to achieve comfort and stability across body types. Packs designated as Women's are best suited for shorter, narrower, curved body types compared to packs designated as Men's Underlid zippered mesh pocket with key clip keeps essentials handy Item Dimensions: 17.3H x 10.6W x 8.3D in; Item Weight: 1.05lb