Desert Drink Bag: capacity 2.5 liters (including 2 liter bag hydro). Made of polyester, breathable dorsalein part. Sacca hydro hypoallergenic material and straw with adjustable valve opening and closing. Anatomical adjustable shoulder straps breathable mesh. Easy opening with Velcro backpack, bag and small inside pocket for storage pocket, dual mesh pockets. Logo printed on the front.