My mom has washed baggies for years. I tried it a few times many years ago. I got soo frusterated as I had no where to dry them decently and they took so long to dry. I do reuse them if not yucky. Dry things, i reuse them until they don't seal any more. I try to reuse them for the same things so there is no odor transfer.
DH works in the office now, so almost everything in his breakfast/ lunch box is in plastic containers or wrapped in waxed paper squares and foil. DGD has a plastic container for her sandwich, I try not to put many other containers in her lunch as she walks 1/2 mile to the bus stop and it gets heavy in her backpack with all her books and stuff.
I used to save a lot of plastic containers from foods and almost all glass containers. I had so many I didn't use most of them so I threw them away, they were taking up lots of room. I hadn't ever thought of using canning jars, I will have to start doing that.
Monica