What should I bring with me from the year 2024 to my average day in the year 1024?

I've been given the chance to see life in the year 1024, and I'm wondering what might seem like a fun knick-knack from my time to bring to leave with them. I'm not too concerned about disrupting the timeline, and I'm not going to bring anything expensive or durable like a gun or a solar panel. I'm just looking for something to give to the people I meet, something from my average day that might seem like a weird trinket or piece of magic to them.<br><br>I'm leaning towards a small piece of memory foam, maybe a couple rubber bands, and a small piece of the sticky side of packing tape. I've also got some chemical cold packs if I think they might be useful, but I'm not sure.