These bread tags (also called bread tabs, bread ties, bread clips, or bread buckles) are typically a quadrangle with a hole on one side that is used to keep the bread bag closed.

Although they're easy to overlook, the little plastic clips used to keep bread bags closed can easily be reused both in and out of the kitchen.

Additionally, it said a bread clip kept in a wallet could help to keep track of your drink at a party, label keys, and keep cables organized. However, the article didn't really offer any travel tips.