MAMMUT Mammut Lithium Add-on Bottle Holder Drink Holder Size: Approximately 10cm x 15cm The Lithium Add-on Bottle Holder is a lightweight and practical bottle holder for the Lithium backpack series. The outer fabric is made of recycled nylon, and the lining is made of recycled polyester. It can be attached to the hip belt or shoulder straps of a backpack using belt loops and hook-and-loop fasteners. The size is adjustable and can hold up to a 1-liter bottle. You can quickly take it out when you need it.