: If you are sealing food for the freezer, insert a straw into the small unzipped gap. Suck out the remaining air to create a DIY vacuum seal, then pull the straw out as you finish the zip.
: When a bag is "chubby," the tracks often misalign. Use your thumb and forefinger to pinch the start of the track firmly, ensuring the "male" and "female" ridges are perfectly nested before sliding. Chubby zip lock zip
: To get a tight seal on a full bag, zip it almost all the way across, leaving a tiny gap. Gently press the air out of the bag until the plastic hugs the contents, then quickly slide the zip shut. : If you are sealing food for the