Warden non leaking hip flask. The Warden hip flask is a single wall aluminium bottle with non-leaking function. Screw-on capÃƒÂ¡ is equipped with a metal D-ring for easy carrying and attachment to your carabiner. Volume of the bottle is 500ml. Presented in a gift box. Exclusive design. BPA-free. Aluminium, polypropylene and metal.