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Our flasks come in two sizes - 350 ml and 500 ml - and feature a soft, high-flow bite valve so you don't lose a drop and a wide mouth cap for easy access and cleaning; and each bite valve has a dust cover for even better hygiene. And now Made of tough thermoplastic polyurethane (tpu), the flasks are bpa, phthalate and pvc free, and made from recyclable materials. They also feature a printed volume scale (in ml and oz) so you can monitor your fuel mix and consumption rate. Most importantly, they shrink in size as you use them to save space.