@68degreesorless
Yes definitely agree that need to treat the nylon fairly carefully.
I do have a backpack from them, but I got it for £120 on sale and it is small. Other than that and the crag tote, all my bags from them are small slings / shoulder bags / tote made from the tanker nylon and, as you say, can scuff.
You are quite right. For me their backpacks just aren’t heavy duty enough or designed for being abused. I also learnt the hard way with bags generally years ago, when I had a prolapsed disc and discovered that the load distribution on a number of my backpacks / messengers was shocking. That led me to the made in USA mil-spec mystery ramch packs. Have five Mystery Ranch packs now 3DAP, ASAP and 3 of the Carryology packs. All bullet proof and hard as nails (albeit the are designed to be carried on two shoulders).
Thinking about it, I bought one of the larger porter daypacks for my wife (£140 reduced from £400) and the first thing she said was that loved the fabric, but rubbish for carrying heavy loads.
I personally would not buy another backpack from Porter as pricepoint to high and not robust enough to warrant it. I do love the smaller bags that I have from them though, which are all beautifully made, with lots of design choices! I did get them all on sale / cheaper than the current extortionate prices that some UK stores now charge.
As an aside, although I see the merits of the Gr1 and its construction (I have one in black x-pac), not a fan of the front pocket and it does essentially look like a big fucking lunchbox. I have also found the molle configuration to be fucking useless! Still, I can see why people like them / rate them.