I have made sandwiches on wheat bread with turkey, mayo, mustard, cheese, and lettuce. I found that you can wrap the sandwich in either plastic wrap or in a napkin and then in tinfoil and place it into a sandwich bag. The longest it can be left there is 1 or 2 days, then the bread starts to get soggy and everything starts to mold together. Plus it doesn't taste very good any more. The same with peanutbutter and jelly, 1 to 2 days, then the jelly starts to soak into the bread and the oils start coming out of the peanutbutter. So FRESH is always best.