Paladineer 8L Hydration Backpack Daypack Cycling Pack Sport Bag Hiking Backpack Bike Backpack Nylon Ultralightweight & Durable: Made of water resistant rip-stop nylon; Reinforced SBS zippers of high quality Utility:Pipe clips for easy hose positioning; Reservoir compartment to hold your reservoir with ease; 8-liter volume is ideal for very long and extended running sessions and is roomy enough to hold food and light clothing Comfortable: Ergonomically designed,your comfort is a priority: Padded back provides support for a comfortable fit,Padded shoulder straps for a comfortable carry;Mesh airflow on back helps you to stay cool and to avoid the sweat odor Unique & Professional Design:Adjustable shoulder straps for a custom fit; Quick-access pockets on the shoulder straps for you to store your smartphone; An invisible mesh pocket on the shoulder straps to hold your water bottles Note: This pack does not include a water bladder.Please purchase the water bladder separately; The size in the picture is measured by hand. Please allow little deviation.