I bought the bag to take with me on a 3 month trip. I havent gone yet, but have started to pack the bag up and it is surprisingly spacious. There are hundreds of little pockets hiding everywhere. The bottom part of the bag can be kept seperate from the main bit, which is good for keeping things aprt.. like dirty washing or towels.
The back straps are really comfortable, but i havent filled it up completely so not too sure how heavy it will be when full.
The only problem i have with the bag, is when you zip away the back straps you also zip away the only handle. So if you want to pick it up you have to grap it from the clips which i think is a bit strange for a bag not to have a handle. (Unless i havent found it yet!)
Overall nice sturdy and durable bag!