For whatever reason, you've decided you would like to store something in a plastic bag and don't want air to get in. Maybe you don't trust the seal on a resealable bag or want to store something in a plastic bag that lacks a resealable strip. There's a way to permanently seal a plastic bag, barring a deliberate attempt to open. It's a great solution for food items you want to store securely or give as gifts, and it's an economical way to store and organize buttons, beads or other small objects.
Place the contents you want to store in a plastic bag.
Fold a sheet of aluminum foil over the opening, covering the opening completely on both sides of the bag.
Run a heated iron over the foil, being careful not to touch the plastic or the contents.
Wait for foil to cool and remove. You now have a permanently sealed bag.