I buy meats in bulk and re-package in smaller sizes with my Food Saver Vaccuum machine. The packages always have a flap on the sealed end the rubber bands enable me to fold over the flap and secure it in place so I can stack them better in the freezer.
I use these as teaching aids as an orchestra teacher. We call these "bow belts." One of the best things for keeping everybody's thumbs free as they learn a beautiful bow hold. "The thumb is the tongue of the hand" - Margaret Rowell 20th century cello pedagogue.