Ever wish you could easily seal up a bag after opening it? Well, turns out that you can, and quite easily as well. All you need is an iron and some aluminum foil. For bags that don't already have one side that's made of foil, you're going to want to lay a strip over one side. Place the bag down over a piece of cloth. Then, with the foil covering the plastic, run your iron over the top of the bag.
The heat from the iron will melt the plastic underneath the foil together, creating a seal that's almost as good as new. This is a hack if you plan on shipping something that needs to stay fresh.