That's a nice project. It would be very sturdy. If I had to boil water in my aluminum tins, I guess I'd be brain dead by the time I finished drinking it because of the stuff that comes out of aluminum (yes, I'm exagerating). And the water in the tins wouldn't fill a cavity in anyone's mouth!

So the top comes off and goes on the bottom, you make a new top that will be waterproof (gasket) and you put your items/tools in. Is that right? Then you maintain the flask by figuring out a way to reattach after you've dumped everything in your pockets? I don't mean to sound stupid, just want to make sure I have it right.

Is the flask heavy? I held one once and it was kind if heavy, but that might have been an old-fashioned one.