The Oasis1100 by TETON sports is an 18-Liter backpack. It comes with a leakproof 2-liter hydration bladder and a large 2-inch (5 cm) opening for ice that also makes cleaning easy. You can adjust the shoulder, chest, and waist straps to get your custom fit. The pack is available in olive green, orange, bright green, and bright blue; it also includes features normally seen on more expensive packs; read the reviews below. The Oasis1100 comes with a 2-liter hydration bladder. Great for hiking, cycling, backpacking, and anytime you need room for some gear and plenty of water. Integrated rain cover keeps your pack (and the gear inside it) dry when it rains. Adjustable shoulder, waist, and chest straps all work together so you can wear this pack for several hours comfortably.