All I can say is, great minds think alike!
Here's a thread from a while back on another forum (I'm "black arrow" there):
http://www.dirttimeforum.com/index.php?topic=544.0. The idea was to have a boiling vessel that would take up minimal amount of space in a kit. I then progressed to ss foil (from M-C) with the same folded edge idea.
McMaster-Carr is where I found the ss bags and ordered some in a couple of sizes. They looked doable for the project, but I benched it at that point (McMaster-Carr is where some of the metal comes from for another project of mine). The grommetted holes appeared to be a necessity as did a "spacer" to help hold the bag open and allow for the highest capacity of liquid.
That idea came from one on this page, which shows my first generation fold-flat vessel:
http://www.dirttimeforum.com/index.php?topic=436.15
Did you smooth or burnish the edges of the bag?
I didn't use gloves for any of the work, but it's a good idea.
I was picturing it's inclusion in kits such as the Ultimate Survival Technologies hard-cased kit:
http://www.ultimatesurvivaltech.com/ust_website/root/deluxe_survival_kit.html , which I like.