They DO hold up well to travel stresses. They are just so unappetizing that you hope you have something else to eat. They reminded me of Space Food Sticks in consistency and taste. I LOVED Space Food Sticks as a kid, but the texture and flavor to the adult palette I expect would be a bit lacking. (A quick google of Space Food Sticks reveals that you can still get them, but I didn't check to see if they are gluten free.)
Coincidentally, Consumer Reports recently busted Enjoy Life's Chewy Bars for being very small for the packaging. I didn't think the Nutbutter Crunch variety I had was quite as aggregious, but really not a lot better than the photo below.