Things that are pricey or large to store, and infrequently used.
Things you would want to try out before investing.

• Wireless hotspots
• Portable power stations
• Home tools and measuring equipment like a sound meter, non-contact thermometer, thermal camera, kill-a-watt, post pounder, endoscope
• Yard games like yardzee or jumbo jenga
• Musical instruments like hand drums, steel drum, electric keyboard, theramin, bagpipe chanter, thumb piano, ukulele -If you don’t already count them as media: Video/board games and consoles.
• Craft equipment like Sewing machines, a rigid heddle loom, cricut

Source: Spouse works at a library gearing up their library of things