I need some gift advice here

A co-worker is leaving on Monday, well it’s here last day anyway, to go and backpack across Europe.

I want to get her something, but I am not sure what. I was going to try and keep the price down under 50 bucks. Do you guys have any idea what I could get her? She doesnt need music or a camera and I know she really can’t carry TOO much.

So… any ideas?