This looks like a larger keychain that you clip it carabiner-style to your bag to hold your hat.
A cotton one won't take as much space in your luggage, and you'll find that once you've brought your own robe on travel you can never go back.
After decades of wearing trendy brands of aviators which we found classic and cool, we tried ROKA and wish we had sooner.
These packets are easy to use, effective, and rinse easily even in a little hotel sink.
I always pack this mini tube of Megababe Thigh Rescue in my bag.