I don't use my hiking or hunting packs for rucking. I've been a three to seven day a week GORUCK'r since 2019 and am on my second GORUCK Rucker pack. My first, 2019, was the early generation without any of the improvements needed to make the pack comfortable.
I bought my current Rucker 3.0 in 2021. They are onto 4.0 now.
Anyway, I ruck 4 miles on Monday, 4 miles on Wednesday, and 12 to 20 miles on Saturday. Every week. Rain or shine. Negative temp to 100F.
My weight has been 65 pounds for a long time, but two weeks ago I added another 10lb plate bringing me to 75 pounds.
The ruck has approximately 5600 miles on it (as tracked by my Sunnto AmBit Vertical GPS watch) and barely shows any wear at all. I've used this ruck on several 25 miles and several 50 mile GORUCK events too.
I really don't feel even my Kifaru packs would hold up to this "hard use" with ruck plates in them. The materials just don't seem as durable.
A coworker started rucking with his western hunt Stone Glacier pack but bought a GORUCK set up late last year because his SG bag was showing wear after weekly rucks for 9 months.