Kamille 16oz Stainless Steel Coffee Tumbler - Double Wall Vacuum Insulated Travel Mug for Hot & Cold Drinks - Leakproof Lid for Coffee, Tea, Iced Beverages - Perfect for Office, Commuting & Outdoor Activities

I have been looking for this kind of insulated travel cup for a long time! I travel in my car for work a lot as well as go on boats, so I definitely needed a 100% stainless steel travel cup with a "stay-on" screw-on lid that doesn't spill its contents out when I drive on bumpy dirt roads. I can definitely safely drink from this cup by pushing on a single button with one hand while driving .It also keeps the contents hot for almost an entire day while I’m out in the field and it’s honestly much better than a big thermos. The strap is also great because I can put it around my wrist . The strap is quite genius and is a great added bonus whenever I carry an armful of measuring tools from the car to a site.It's not perfect of course - if you don't screw the lid on right, the cup will still leak. It's also not replacing a kitchen mug at home and therefore can't be used with loose leaf tea or thick liquids like cream soups because that would potentially get stuck in the lid mechanism you drink from. Cleaning the lid requires a 10 sec action of undoing the lid's bottom plate (which is good that it comes apart - regular travel cup lids can get dirty with oily caffeine very quickly and therefore are impossible to clean).The cups bright color and the non-slip rubber grip filled with steaming hot black coffee make me very happy -I’m planning on buying another one in more colors