Outdoor Products Freefall Hydration Pack with 2-Liter Reservoir, 12.2-Liter Storage 12.2-liter hydration backpack ideal for cycling, hiking, and more; includes 2-liter hydration reservoir Bike helmet holder takes care of your helmet during stops or mid-cycle hikes; main compartment great for storing light jacket, gloves, and energy bars Breathable deluxe padded back, padded shoulder straps with adjustable sternum strap; multiple compression straps Hydration reservoir includes tubing and easy-to-use bite valve Measures 8.5 x 18.3 x 5 inches and weighs 0.45 pounds; backed by the Outdoor Products Plain + Simple Lifetime Guarantee