These are bags for you to wrap your sandwich in so you can cook it in the toaster. I, ahem, may have already been doing this for years, without such bags, much to the chagrin of my parents.
I haven't really done such things in a long while, but years back before i was shown how to use the oven, i was a wiz with our top loading toaster, i used it to cook the things that weren't designed to be microwaved, like chicken fingers at times, or the occasional Grilled Cheese.
