Hydration Pack Backpack Set - This water bladder bag set are including 1 water bladder(2L), 1 brush, 1 interchangeable curved mouthpiece is equipped with a detachable water hose for easy cleaning with the free brush, The curved mouthpiece also features an interchangeable one for healthy using 4 Hours Liquids Cool - The front pocket of the bike backpack is designed with an independent insulation layer, which can effectively cool water and drinks within 4 hours, With the wide mouth, you can easily fill, clean and dry the bladder during the clip, The holder makes it convenient and quick to open and close without leakage Splashproof Hydration Backpack - The running hydration pack contains 1 insulation layer , 1 main Pocket, 1 front pocket, 1 front mesh pocket, 2 side pockets, The SBS zipper is made of splashproof nylon to prevent water from getting inside which offers lasting durability, It is great for hiking running cycling biking camping mountain climbing walking drinking hunting riding jogging and other outdoor activities Comfort Hiking Backpack - This bike backpack adopts ergonomic mesh and the adjustable S-shaped shoulder straps which are double padded and adjustable, using breathable back and waist belt which are padded with mesh material fit for your back, ensuring optimal comfort and pleasure all day long even when fully loaded Upgrade Design Reflective Strip - Hydration bladder included and can be replaced with another mode bladder, The Atarni drinking bag is your faithful companion when you ride a bike or do outdoor sports, The reflective stripe design makes night activities safer which also as a way of adding the visible area and warning the passing vehicles, protecting you safer and reducing the possibility of injury at night