I hope I recall correctly: I was watching an episode of wan-show where they looked into a backpack returned from a miner after heavy wear, but little real damage. Live on the show they wanted to showcase the double bottom, so they cut into it (can't recall if this was in the miners backpack or another one) and were surprized to realize there wasn't a double bottom. Linus quickly assured, still live, that this would be handled for all customers.

LMG did blame the manifactures of the backpack for removing a layer in a late stage design adjustment, but LMG have also alledegly taken a huge cost on assuring customers that they can receive a new backpack for free if the bottom fails for any reason.

My memoery of this might be fuzzy, and the story I have heard comes fully from LMGs perspective, so take everything with a grain of salt.