Check out this design from fan Raymond Rowell! You can check out his work at HarleyWarren.com

.: Materials: 100% stainless steel (body), 100% polypropylene (lid)
.: Available in three sizes: 12oz (0.35 l), 18oz (0.53 l) and 32oz (0.95l)
.: BPA-free, twist-on lid
.: Double-wall stainless steel construction

Handwash Only