Depending on the type of "exchange" you're referring to, the most "useful piece" can range from a historical coin to a versatile travel tool.
: A "lifesaver" brick of energy for long travel days or when access to outlets is limited. Useful Pieces for a Gift Exchange exchange
: A practical item that is useful for everyone in a tech-driven world. Depending on the type of "exchange" you're referring
For a gift exchange (like White Elephant or a "Favorite Things" party), "useful" pieces often fall into practical or consumable categories: exchange
: A lightweight piece that dries quickly and takes up minimal space in a backpack.