It might be small in size, but the Shortstack is built to go big. This compact 8 oz. mug will keep a double shot of espresso hot or a whiskey on the rocks cold for hours. DETAILS 18/8 stainless steel, BPA-free with double-wall vacuum insulation. Two-piece drink-thru lid system. Keep drinks hot for 3 hours, cold for 4 hours, or iced for 16 hours. Works with one-cup coffee makers. Leakproof and dishwasher safe. SPECS Weight: 0.9 lb. Dimensions: 3.09L x 3.09W x 5.71H in.