The 21oz / 650ml HYDAWAY collapsible water bottle is an easy-to-use, reusable water bottle designed for people with active lifestyles who are searching for an alternative way to carry water that's just as convenient as buying bottled water. The ultimate travel and hiking companion, HYDAWAY packs down small enough to fit in any pocket. When expanded, the HYDAWAY will quench your thirst during airport layovers, or the final pitch to the summit. This larger size bottle fits in most vehicle cup holders and backpack water bottle pockets. All HYDAWAY bottles feature an easy to use, flip-up straw for quick sips, carabiner-friendly carry handle, and are protected by our Watertight Guarantee. HYDAWAY'S mission is to reduce the 50 billion disposable water bottles that are thrown out each year by offering a more convenient alternative to bottled water. Also, check out our HYDAWAY Travel Case, (sold separately). The HYDAWAY Travel Case fits your 12 or 21 ounce bottle and is great for carrying and keeping your bottle clean.