The lightweight and practical bottle holder is part of the Lithium backpack series. The outer material consists of recycled nylon and the lining is made from recycled polyester. A belt loop or hook and loop fasteners can be used to attach the bottle holder to the hip belt or shoulder strap of your backpack. The size can be adjusted to hold bottles of up to one liter. With the Lithium Add-on Bottle Holder, you can be sure your drink is always close to hand on sweaty hikes.