* BPA-free food grade material

* Sliding seal – opens wide for easy filling and closes tight for a leak-proof seal

* High flow valve – provided with on/off switch

* Dust cap cover to prevent dust from reaching mouthpiece

* Welded seams on exit-port for leak proofing

* Leakproof twist cap for easy filling and secure closure

* Extra wide opening with easy sliding clip secure closure 

* Bite valve prevents leaking when the tube is detached

* Temperature stability improved with insulated tube