Bear is using different knives on each episode. On the Sierra Nevada episode he did not use a knife, just a bit of obsidian for cutting. As far as I know Bear does not have a contract with any knife company to showcase their knives. He does use Gerber (Lmf11) knives sometimes, as well as a Swiss Army folding knife in the Alps episode.
I’m not big on folding knives for a survival tool. Read my article on the survival knife here on the Newsletter for valuable information about the type of survival knife you want to invest in.
Though with Bear using a variety of knives in the different survival scenario’s, one could gather some good information about how they hold up. I have put two beefy knives over the last year to the test. One a Bola, the other a Kukri, these are big knives not your average working knife. I trashed them both by using them just like I would any large working knife. Carving, chopping small trees and brush. Both of these knives were made by an American knife manufacturer. Can’t recommend the company that made these two knives though their customer service is great.