I'll have to check the brand names on the two I use frequently, I also use a 3rd small one from Beaglewaer during ML season. I customize mine by attaching a pair of clip on suspenders to help distribute the weight as I load mine down with lunch, binoculars, ammo, gloves, facemask, water, and jacket strapped on. Dragging a deer out yesterday, my son picked up my fanny pack and remarked on how heavy it was not realizing that I had taken all my layers off and strapped them to the pack. I opt for wool or fleece if possible.
CB