My go-to bags for single-serve meals are well-washed and thoroughly dried mylar snack bags, as from chips, popcorn, etc. Reseal the bottom for safety before adding the dehydrated food, partially seal, remove air with a straw, complete the seal. An ordinary clothes iron on a fairly low heat will serve to seal these. These bags are more vapor and puncture-resistant than most plastic bags. Also, if necessary, they can be placed into a pot of hot water if more cooking time is required.