Cheeki Leakproof Coffee Mug - Pink These coffee mugs are 350ml in size, double walled and vacuum insulated to keep your drink hot for 8 hours, or cold for 12 hours yet they are always cool to touch on the outside. The unique pop up lid is totally leak proof and really easy to drink from. This mug will fit under barista coffee machines and in car drink holders. The mug is easy to clean and the lids are top-rack dishwasher safe. Complete with a hard lid, a large drinking hole and a plug to cover the mouthpiece when not in use. 350ml Size Pop Up Leakproof Lid Premium Food Grade 304 (18/8) Stainless Steel. BPA - Free lid. No inside lining and toxic free inks Easy to Drink From Fits Under most Barista Coffee Machines Dimensions: 16cm H x 6.7cm W (widest point) Double.