You can put in things like AirPods, wired earphones, keys, and small items. It comes with a carabiner, so you can easily attach it to various places. I made this after watching Keekoton's video. Please note that this is handmade, so it is not a perfect finished product like a mass-produced item. Height: Approximately 6cm Width: Approximately 6cm Depth: Approximately 2cm