Om,In my opinion, this pack may be too bulky for school hallways and around campus travel. But you can always cinch down the excess space, and it may come in handy on "Heavy" homework days. Both packs would be useful for school during the week, then dumping gear into it for the weekend, so really its a toss up between the two. As for choosing the proper size, you need to measure your torso. At the top is the "view sizing chart" link. Click on that and follow the directions. Also, if you are planning on carrying a laptop to college, this is NOT the backpack for you. I ride a bike to school and found this backpack so comfortable while riding that I use it for school. Books and laptops fit oddly because of the aircore but also give you a good amount of cushioning between your back and your hard books. It doesn't fit a huge amount of school supplies because they fit in so oddly, but if you have a long commute it could work for a school bag, but if you have other options, I would go with those.