I bought this pack back in June to use in the mountains of CO. I purchased it to do some overnight backpacking excursions, and it has done quite well. I bring a lot of gear, and the pack has been big enough...so far. I do see potential issues with long trips, say over 3 or 4 nights or so. I have not stayed out that long yet, and can't truly speak to that. I am 6' 5" tall, and about 250 lbs, so the larger size was welcome, and the main reason for buying it. My size brings up another factor that I had not thought of, until recently. If you are a big person, like me, then guess what....all of your gear is bigger too. I use a Big Agnes -20 degree bag, and it takes over half of the space in the main compartment. It will flat not fit in the intended bag compartment, at all. I even have it in a nice 2 way compression bag, and it is still pretty large, compared to the size of a normal sized person's bag. I can say this, I carry a good amount of weight, around 60 lbs or so, and this pack does very well!! When carrying heavier loads, the shoulder strap buckles will slip a little, and require periodic adjustment. I have not figured out if this was because I'm trying to keep them too tight, or what, but either way, I wanted to bring it up.