The Ozark Trail 20.5 liter backpack is versatile that can be used Camping, Hiking, Mountaineering, Travel, School, or work. The front bungee strap storage system helps keep your equipment secured and easily accessible. Has a large roomy main compartment for storing equipment and gear. Front stash pocket for keeping small items organized. Fully adjustable padded shoulder straps. The side mesh pockets are great for water bottles and other equipment. The backpack is unisex and hydration compatible but the reservoir is not included. The backpack will fit 2 liter and 3-liter hydration bladders. The three year warranty ensures you will be using this 20.5-liter backpack for many years to come whether you are an adult or teen.