I have several Camelbak bottles with the bite valves. My niece and nephew loved mine so much that they now have their own kiddie versions. But for some reason even though they have their own identical bottles (with cool fish and shark designs too!) they still clamor to drink from mine. They will hydrate themselves like nobody's business with my bottle so I let them drink from it as they pass it back and forth sucking out of that bite straw. By the end of the day I am parched and my Camelbak straw is covered in spit and food particles. Sigh.