These soft, silicone tubes are ideal for the outdoors and anywhere the next adventure takes you. The integrated hole allows them to be securely attached to a bag or backpack with a carabiner (not included) in seconds. Food-safe (FDA), 100% BPA-free and phthalate-free, they are rugged enough for a backpack and soft enough to allow all of the contents to be squeezed out. The selector cap makes identifying contents a breeze and the large opening makes refills quick and easy. Airplane carry-on approved sizing ensures worry-free check-ins. Food grade silicone cap has 5 integrated content choices 1 blank Leak proof bottle TSA approved size 3 oz. (89 ml)Biner hole in top to hang from backpack