"Glad wrap" is a common term used to refer to plastic wrap or cling film that is used to cover food or other things to keep them fresh or protected. Full definition
Here's a tip; line your container with glad wrap first s you don't have to worry about getting nail polish on it! (houseofhipsters.com)
TIP: Once you've cut into your avocado, squeeze some lemon juice on it, wrap it in glad wrap and store it in the fridge to have again the next morning! (bembu.com)