In my neck of the woods, products just like this but with civilian marketing and distribution are sold basically everywhere. The bag seems to be both alu-foil and plastic. The brands I have experience with are local to my location, but I guess you find similar stuff for sale on the internet if not locally. Quite popular among hikers around here, but not exactly high class gourmet, with flavors ranging from edible to will-do-if-hungry-enough.

I'm sure you can make a lot better stuff yourself...

Re-using those plastic/alu-foil bags seems like a better option than using the plastic bags of your vacuum sealer. A lot more compact and lighter than a pot, and a lot more reliable than the vacuum sealer bags. But with that option you haven't really eliminated cleaning from the equation.