EMSA 513361 Insulated Travel Mug sleeve, black, 0.36 liters (4 hrs. Hot, 8 hrs. Cold, Dishwasher, 360 drinking spout, 100% leak-proof) (household goods)
I use the EMSA 513361 for a year almost every day and that's why I find it great: - It is absolutely tight, even when lying transport in a bag full Klöterkram goes nix or drip because of the closure, which you have to open to drink, does not work out