This leak-proof, stainless steel, tea tumbler is ready for any adventure! Its screw down lid and large volume set it apart from our original Mountain Tea Tumbler. Iced or hot, the double-walled insulation keeps tea fresh for hours. The ultra-fine stainless steel filter is large enough to allow for loose tea leaves of all sizes. Simply add fruits or herbs for a spa water experience. This unique design is bold and functional — ready to hydrate you on every expedition!