I am a junior in college and I go to school where it is extremely hilly and it's definitely a hike to class. I know these packs are made for hiking but man, they are great for a college student! This will not be an investment you will regret. I live in Texas, so 7/9 months I go to school, it's at least 90+ degrees. So having that airated back really helps to keep me cool and keep me from sweating on my walk to class. I have not used the 100oz bladder but, from all the reviews I've read about them, they seem to be absolutely amazing. This particular bag comes with a larger one than most bags so, there's another plus! The front pouch has sections to organize pencils, etc. I personally put my glasses, calculator, small umbrella, pencil bag, chapstick, etc in there and it is by no means full. Every compartment in this bag expands and it doesn't make it look bulky which I like!  The inside of the bag can hold so much. I have personally had 2 textbooks in there, 3 full folders, and 3 notebooks and it wasn't even full. It didn't feel heavy on my back either! I have been using this bag for about 2 months now and there is no way I would buy another book bag for class. My boyfriend and I plan to go hiking/camping soon so I will update my review when I take it on that test. Overall, this is a great product that I would reccommend to just about anyone, it doesn't have to be used for just a hiking/camping/biking bag!