I used the ULA Circuit pack on my 2013 AT hike. Held up great. In fact, I think it was the most common pack I saw on the AT.
This year, I took my ULA pack on an attempted Colorado Trail Thru-hike. Early in the hike, an unknown critter chewed off my right shoulder strap, sternum strap, & one of the elastic straps on my shoulder strap. Due to this & a lingering back injury that wasn't healing on the trail, I decided to abort my hike.
After much procrastination on my part, I finally contacted Chris @ ULA about the pack. He said to mail it back to them to see if they could repair it. I did. And this morning, the pack returned by FedEx. It was repaired. He didn't charge me for the repair. I was prepared to pay for any and all repairs if necessary. In fact, I was prepared to buy a new one if it wasn't repairable.
What a company! If any of you are in the market for a new backpack, I strongly recommend ULA.