Made of foof grade EVA, PE and mouth place by quality TPE material, very simple to use, just bite the soft mouthpiece to absorb water, water will not leak out if you have no suck. You can drink conveniently and quickly without slowing you down. There is a big opening for easy pouring of water. Quick-release tube is detachable. While the tube is removed, the connnector automatically shut off. suitable for most water backpacks. Fits for most water backpacks. It can help you keep water in outdoor activities such as hiking, running, biking, skiing, horse riding, camping, climbing etc. Besides 85oz and 100oz are aiailable.