For the longesr of time i had the USGI 3day assault pack, the OG mk1 where every part was replaceable. After it was stolen, i baghopped for about a decade until i settled for a Direct Action Dust mk2. It's really hard to find quality stuff, seems even the military gear is prone to planed obsolescence now. But i'm happy with this one. 6 years in and not a seam ia broken. For longer hikes i have a helicon racoon ripoff: much bigger but also much better seams and sturdier fabric. It doesn't have a brand name and i got it by pure chance so i can't point you to any shop.