I decided to make a shaker tag using my fuse tool, but worried about the durability of it since it will be lugged to and from school on a daily basis. I found these heavy duty clear luggage tags on Amazon. They have a nice zip tight seal that makes them waterproof, a metal grommet, and a stainless steel loop to attach it to your luggage. They're a little larger than I envisioned, but maybe that's a good thing - she won't be able to miss it.
Cole's ABC's Alphabet Dies by Lawn Fawn
Glitter and Microbeads by Martha Stewart Crafts
Fuse Tool by We R Memory Keepers
Cruise Ship Luggage Tags