Definition of "elastic band" []

• A small, narrow loop of rubber or similar material used to hold items together. (noun)

Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License

• "Clawing her way up in darkness, her headlamp slung by its elastic band over her wrist, Anna wished she'd had sense enough to wear a hard hat."
• "Frank Abbott slipped an elastic band round his notebook and put it in his pocket."