Long story short, this thing quickly became my constant companion, and not only got me through two very specific, very straining periods and just about every conceivable use-case and stress test but in the end, the only thing to give out was the teeth on the main zipper, and the chest clip, after extraordinary over-use with both. Both were still usable (!) but as this has gone from my life-pack to my work pack, I'm simply purchasing another for sake of freshness. As for the two periods we've gone through:1. When I realized at the end of 2017 that I was on a rapid slide into poverty and only months from homelessness, I made the call that it was time to start preparing, and purchased this pack (Stock, Gray2 40L) and sure enough, it very quickly became my constant, trusted companion through a rough 18 month stretch where all of my belongings were inside, easily more than 100lb+ daily.Rain or shine, the yellow rain cover kept my clothes, hydropack and knicknacks up front, plus the papers and laptop snug in the back sleeve (though that main have been intended for hydropack/bladder, I found it kept my laptop safer and my back straighter having it all the way in back) - No water damage ever, even in rain, even when my hyropack leaked, which is why I kept it on bottom in the first place. That rain cover is attached by some elastic and was easy to zip out and deploy and pull over the stuffed backpack the moment it was needed without removing the back. After enough use, I found myself easily deploying it one-handed from muscle-memory alone without a thought.Sidenote: The cover zipper quickly became the spot to store personal ID and other sensitive stuff when sleeping or being stuck in some risky places. everyone goes for the top and side pockets, or jeans or coat, no one looks underneath. Speaking of, a mini personal air mattress fit snugly on the upper outside loops and while a heavy down sleeping bag wasn't able to fit in addition to my other belongings, I jerry rigged two cords on either side of the outside cover of my sleeping bag and looped those around the detachable side clips of the bag and never once had any issues with space. I could go on and on about how much use this bag had during this time.2. After I finally had a stable job and home again, I worked in IT and moonlighted as a housecleaner. In a way, having genuinely debilitating OCD is both what caused my homelessness and what helped me climb back out with my head held high (the adjustable and front backstraps also aided in that posture maintenance though) and having cleaned and washed the pack monthly, I was able to continue using it professionally to transport all sorts of supplies from hard drives and motherboards to a dozen liquid cleaners, two dozen towels and an only partially dismantled swiffer w/ wetpads and during that period, it went through a LOT more stress than before as regular santizing and stain removal became part of the job.When a cleaner leaked inside the pack due to poor placement or other stupidity on my part (we are WAY off the intended use for this back, I'm literally just filling it with corrosive liquids by now), I actually didn't even notice right away because the layers of padding and weatherproofing and the raincovers zipper placement on the bottom, which all basically slowed and pooled the leak so that by the time I noticed, quite a bit had been absorbed yet I still had the time to make my way to a bathroom to unload and wring out everything.Because of the proofing, drying it out if the bottom/back foam/cushioning is heavily saturated or when laundering to clean off stains or accumulated internal mess DOES require a lot of complex dismantling and inverting, then rinsing with some applied pressure against the shaping and bottom foam then an overnight soak and second rinsing, wringing and applied pressure before leaving it inside out for a full second night to air out. (if it's saturated enough to drip dry, or not turned inside out, it will not dry out on it's own overnight but thankfully it really does not tend to get excessively soaked unless you bungle things up and use it in all these monstrous ways like I did.I'm buying another now - Not for either of the two reason used before, I have an apartment and a proper caddie for my supplies - but because I've kind of started to miss the outdoors and would like to keep hiking and exploring recreationally and not simply out of necessity. And after all we've been through, I know there's at least one pack I can depend on when I step back out into that great blue yonder.