Now if someone please could produce a stainless steel hip flask without seams.... Or a similar rectangular stainless steel container, about 1" by 3-4" wide and about 5" tall. I guess that shape is kind of tough to produce from one lump of metal, no seams allowed.
I've been tinkering with a cut-down stainless steel hip flask for my kit. The flask is made of one cut-out bottom profile and a rectangular sheet that is wrapped to the "hip flask" shape, so it has one seam along the bottom and one along its length. The seams are probably welded or soldered. I don't know what kind of stuff the welding/soldering could release when you put that on top of a hot fire... Like plastic liners, it's probably not such a big deal for emergency, one-time-only use, but I still don't like the idea. It will have to do while I search for a better solution.