Knew a couple guys when I was in the military who used Eberlstock. Very nice bags, especially if you want to use it to holster your rifle as you walk, but they're pricey.

I have 2 mystery ranch bags and they're fucking bulletproof, but again pricey. Literally fell down an entire mountain, falling 5 feet getting back up and then falling again moving like 7k' elevation because I packed horribly and we were on shale, in Afghanistan and the thing is still intact. Straps are almost blown out from that, but I've heard they're very good at repairing stuff if it's needed (but could be wrong on that, have never had to do it myself). My other one I got for free on a mission from some officer that liked me and I used it on a shit ton of missions, through college after getting out, a ton of hikes, and still use it on the mountain and to hold weights when I work out. Thing is still in super good condition. If I was getting a smaller pack again, I'd go with the Mystery Ranch Rats Pack, just because I know how well they're made.

If I was getting something larger, and didn't need or want a holster, I'd go Tactical Tailor. My bigger Mystery Ranch bag is strong as hell, but I don't like how it can't be synched down closer to the body, which can throw off balance if the pack isn't fully filled (and was part of the reason I fell down a whole mountain with it). The Tac Tailor MALICE packs are just incredibly strong, shit can be synched, and super modular. If some shit does end up breaking, you can always buy a small replacement (not sure how their returns work, could be good or bad idk) and be back in the game instead of having to buy a whole pack.