Close your CamelBak water bottle with the hidden storage capability of the Pak™ cap. Conveniently store snacks, vitamins or other small essentials in the top half of the twist-on cap. Leak-proof when closed and easy to clean. Compatible with MultiBev™, Chute® Mag, Eddy®+, Carry Cap, and Hot Cap jars. Free of BPA, BPS and BPF.