One of the best ways to keep food from spoiling is to seal it in an airtight bag, but you might want to reuse the same bag a food came in instead of putting it in a new Ziploc bag. To do this, reddit user gastropump suggests using an iron to cinch the bag the shut.
It's the same basic premise as a vacuum sealer, and it works great to keep food lasting longer. With your food inside the bag, fold a piece of aluminium foil over the opening of the bag, then run the iron over the foil for a few minutes so the plastic melts together. Wait for it to cool and remove the aluminium foil. Now you have an airtight bag to keep your food from spoiling too quickly.