I have an old version...much older version...of the London Bay Trading Company's 3 day assault pack. It's made out of a very heavy condura material. I can't say what the current versions are made out of. The one use is very simple and very strong. I took the light belt of of it for how I use it now. I use it every day..... The one below is a newer version and a little different design. I've not used one of the later versions but for toughness, the one I have would be hard to beat.
https://lbtinc.com/collections/apks/products/1476a?variant=13181689167915
