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 biner 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-insulated Coghlan's makes the outdoors more comfortable and enjoyable with over 500 accessories for camping, hiking, fishing, and rving -- from cooking gear to first aid kits, Insect netting, firestarters, tent repair, and more.