- Fits popular hydration vests and backpack water bottle holsters for quick and easy drinking on-the-go* Medical industry USA-sourced bottle material is PVC/BPA-free and doesn't leave a plastic taste* 350mL, 500mL and 750mL capacities.* Bite valve or streaming flow, twist the bite valve to open the mouthpiece for thirst quenching full volume flow* Handy strap for rolling up empty bottle for easy of storing.* Custom colors and branding available.