All around a good sized bag with the right amount of functionality. I used it on a week long field trip for my company in Wyoming (fall season) and enjoyed it. My only complaint is the material and how thin it feels. I haven't actually damaged it, but part of the weight factor (its REALLY light) is likely due to the material. I'm also not crazy about the outer straps and the way they slip or slide on their own sometimes. I could likely replace that webbing with some more firm/ridged webbing to hold against the straps so it doesn't slide (webbing that comes it with is too silky or smooth and it slips sometimes on its own.)
I was going on day hikes up Mt Lemon by where I live and my friend was having a hard time keeping up. So I looked into a sack that would hold up well and be able to hold a lot of weight. Great news this is the sack. I'm able to toss my little person friend in the sack and I can take him up the mountain with me and the sack is so big he is able to do things in the sack while I'm carring him around. Last weekend he was making me sandwiches inside the sack while I carried him around the mall. The only cons I can see with this sack is the fact that it doesn't have deployable ladder attached to it so he can get in and out without me dropping him off of my shoulders and the sack could use a little more padding he's always complaining about how I'm not paying attention and hitting him off of trees and rocks. He would also like it if you installed some kind of lighting for the inside of the sack. Overall I would buy again.