Well, I don't have a carbon fiber uke (not that I don't want one), but I do sport a Fluke walking across campus, walking the dog, and longer travels. My criteria for a travel instrument included 1) exceptional durability, 2) tenor, and 3) relatively loud. Domestic manufacturing and color choices were welcomed extras. The Fluke has car camped from the beaches of the East coast to Utah.
Last week, I strummed across campus, and was fine until the first landing of a stairwell. I caught my toe, bumped my shin, and "splat" went my Fluke. It fell soundboard down, perfectly flat with no bouncing. The bruise faded, and the Fluke was without a mark. However, I just almost took my KoAloha on my trek across campus.
Lessons Learned
1. Do not strum while climbing stairs.
2. If you have a travel uke, use it.