The water bottle bag is hung on the shoulder strap of the backpack through a set of fasteners, and the water bottle is adjusted to a proper height by adjusting the ladder buckle on the fastener group.Product description 1. The kettle bag is hung on the shoulder strap of the backpack through a set of fasteners, and the kettle is adjusted to a proper height by adjusting the ladder buckle on the fastener set. 2. The water bottle bag can be hung outside in many places, such as on the shoulder strap, belt, waist bag, camera bag and so on. 3. When the kettle is not needed, it can be stored into a small bag, which is convenient for storage and carrying.Product attribute Name: Outdoor Water Cup Bag Material: Nylon Processing methods: soft surface Function: foldable, telescopic Accessories type: aluminum hook Number of shoulder straps: no shoulder straps Color: black, green, blue, red, silverWarm reminder 1. Please remember that due to the lighting effects, the monitor's brightness / contrast settings / etc's, there will be some slight differences in the color of the pictures and the actual items. Measured by hand, deviations of 1-2 cm are possible. 2. Please leave us a message if you have any questions. We will respond and offer you our best service.