Caribee"s New Stratos XL Hydration backpack features a sleek, lightweight design constructed from durable 600 Denier Polyester. This 18 liter hydration compatible pack offers 972 cubic Inch of carrying capacity with the H2O outlet at the top of the pack (bladder not included). The action back padded harness system with air mesh padded & adjustable shoulder straps offers a more custom fit with a detachable hip belt & sternum strap for equal weight distribution. Other internal features include an Audio pocket with cord port for electronic devices and fully lined internal compartments with an internal organizer panel. Exterior features include, Six (6) space saving compression straps & side mesh utility/bottle pockets makes this pack a great option for when you"re on the move, perfect for a day hike, or everyday use around town.