Zojirushi 16-oz Stainless Steel Mug

I have had four mugs all with the same functions in different sizes. They all can keep the coffee warm enough even over night. Painting on aluminum would come off if they fall onto hard surfaces which happen on the driveway.

Buyer aware. Seal design is flawed. You must take apart the cap and clean frequently otherwise it gets very dirty. And the process is not easy.

True. But still worth every penny, better than almost all other bottles. //@anonymous: outside coating easily peels off

outside coating easily peels off