The body of water bladder, straw and nozzles are made of biodegradable environmental antibacterial TPU material, safety and no odor. More scientific shape design makes it easier to install package. Full line pump & pull wide mouth design, super wide mouth, easy to add water or the ice cube. Easy to dismantle pipes, have the switch and the flux control. The base of the pipes have the automatic shutdown function, keep no water outflow when remove the pipes. The design of the nozzle is according to the best angle of drinking when carry on the back.