Red Jacket US Army 3L 3 Liter (100 ounce) Hydration Pack Bladder Water Bag Pouch Hiking Climbing Survival Outdoor Backpack Rugged 600 Denier Polyester heavy-duty construction with PVC lining, resistant to tears and abrasion Fully removable 3 liter (100 ounce) water bladder Slender design for physical training ; fully adjustable webbing shoulder straps Hands-free hydration hose with bite valve, gently biting the valve opens up the flow of water Sleek and compact design, only 17" x 8" x 1.5" in size and 15 ounces in weight