FWIW, I think the smaller Imusa fits over a 1 L Gatorade bottle, probably wrapped with Reflectix. It would be a pain to clean out some beverages, but you COULD use the Gatorade bottle to hold your beverage. (I did, it usually was water. If I wanted something else, it most often went into my cook pot after the meal.) You also could cut down a Gatorade bottle for your mug. Many of us would not put up with the weight unless it had a second use.

Also, you might find a silicone band to use as a lip guard. I usually just use a smear of high temp RTV silicone sealant to make pads for grabbing pots and as lip guards. Please be reminded that either the inside or the outside of a metal cup can burn lips. You probably can "train yourself" to drink without burning yourself on the inner rim.

HTH,

CamperMom