I bought Cabelas brand to use for hawking because I didn't have enough brush pants to wear every day. Plus, they are nice to just pop on and off over jeans.
The cabelas brand ones are light and I got two extremely abusive seasons out of mine so far. That is 3 months of 4 days a week. The bottom cuffs are starting to come out, but otherwise, they are still functional. I can't imagine NEEDING anything heavier than these. I walk though rose, plum, tree piles, honey locust, those damn green vines that are covered in needles... When I'm hawking, I'm going through that stuff the whole time, nothing like how I would walk around it when I am following my bird dogs.