Flip-Straw Bottle Cap, stainless steel straw and flip-top cap. Perfect for on-the-go sipping, simply flip open for drinking and flip closed for leak-proof carrying. The detachable stainless steel straw can be removed to create a splash-free, sports bottle experience. Fits 500ml (17oz) S'well bottles. Also fits 260ml (9oz) S'well bottles (without straw).