Great medium sized bag. I'm a college student in Oregon and carry my laptop, books and whatever else in this bag a mile to and from class each day, as well as on airplanes as an overnight bag. Comfortable both on a bike as well as walking, and the material is very waterproof to keep everything dry, even in heavy rains. There is one larger, zippered pocket and three smaller, un-zippered ones just under the front flap, and two velcro
-closed ones inside the bag itself, along with the laptop sleeve. The pockets are a little small, but still hold pens, phone chargers, or other small things you don't want loose in the bag. I have an older 14" Acer laptop that just barely fits into the laptop sleeve, but with a new, slimmer model I don't think you would have any problems. The clasp that holds the shoulder strap in place has come slightly loose on me only a couple times, and only when the bag was extremely overloaded with weight (a box of beer in addition to books, laptop, etc.). If the looseness of the strap became a constant problem, however, it would be very easy to secure it with a couple quick stitches. Overall great bag.