22 oz Bison Tumbler. Leakproof and adventure ready. (GEN2) Not all tumblers are the same. Take our Bison 22 oz. tumbler for example: we used some of the thickest stainless steel on the market to build it because we wanted a strong drop-resistant tumbler that you could use for years. Vacuum-insulated construction keeps liquids cold for 12 hours and hot for up to 6. We finished it with a leak-proof lid and powder-coated exterior for a steady grip that won?t chip or fade. Load it up with craft beer coffee water or whatever your favorite beverage for temperature control that travels with you.