Found this aluminum mug at a flea market today where people import cheap crap from China and sell it. Guy has a whole box of them.
2.07 oz, 22oz capacity, 10cm mug.
Lighter than the IMUSA mug by 1/2 oz, and no rivets to leak either on handle, tack welded on.
Looks like a winner for a solo pot. Cheap too, extremely cheap.