Configure your CamelBak running vest to your hydration needs with this adapter kit featuring a screw-top cap, a longer tube, and an integrated bite valve. Adding extra length to the Quick Stow Flask, it lets you directly take a drink without having to remove the bottle out of the vest's pocket.. . Hydroguard?? technology inhibits the growth of bacteria in the tube. Bite valve self-seals to eliminate annoying drips. BPA/BPS/BPF Free: Yes. Imported.