Lightweight nylon backpack packs into its own pocket. 17 liter main compartment has a gusseted drawstring cinch closure. 1 liter top hanging pocket with zippered access and internal webbing loop. Dual poly mesh side pockets hold 1000ml bottles. Pack stuffs into its top hanging pocket for simple storage so you can fit it inside your luggage or any other bag. Front panel bungee cord for quickly stashing extra layers. Internal hydration reservoir clip and exit port for reservoir tube (not included). Hose management shoulder strap webbing loops.