They are thicker than the ones that came with the foodsaver, but I don't remember how they stack up for thickness against the small number of other brands we tried. They seal excellent, and were the best of the bags I tried. I last ordered in 2017 and am only about halfway through what I ordered.
I've been using them for the half steer we put in the freezer every year, my last elk in 2017, roasted chiles, and bulk chicken and such. Everything goes into a deep-freezer, with no defrost cycle, so the food tends to do better long term anyway. We've had zero problems with that brand.