1.Keychain Feature: The water bottle carrier bag is designed with a keychain attachment, which allows for convenient hanging of keys or trinkets. This thoughtful addition helps maintain a clutter-free arrangement of your items, ensuring they are neatly organized and less prone to being misplaced. 2.Multifunctional Design: This water bottle holder is a multipurpose with a detachable strap that can be formed into a -body bag or a shoulder sling. It's perfectly tailored for a wide array of outdoor ventures, from trekking through mountain trails to camping under the stars or cycling along country paths. 3.Superior Quality Material: Constructed from robust neoprene material, the water bottle sleeve is engineered to withstand the tests of time with its durability, waterproof characteristics, and resistance to oxidation. This protects your water bottle from the common wear and tear associated with everyday use, thereby prolonging its functional life. 4.Ample Storage Capacity: The layered design of this bottle sling bag does not only cater to carrying your water bottle but also offers additional storage compartments. These are ideal for stashing away everyday necessities such as smartphones and keys, providing the convenience of having all your personal items within arm's reach. 5.Customizable Strap Comfort: The water bottle bag is fitted with an adjustable shoulder strap, meticulously designed to cater to personal comfort preferences. It allows for easy modification to match individual height and body type, effectively reducing the burden on the shoulders and elevating the comfort level for a more enjoyable experience. Color: Black Material: Neoprene + woven fabric Package Contents: 1 x Cup bag 1 x Keychain 1 x Mountaineering buckle Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.