Summary: I'm amazed how great this bag is. I got the 17" backpack for my 15.6" laptop because I also keep it in a thick sleeve; it fits perfectly. There are a ton of pockets and holders, and a good amount of space inside. (If you have super thick books, I don't think this pack will work for you.) I love the thick, meshed padding on the straps and back. I have a 32oz nalgene water bottle, and the bottle holder stretches to accommodate it. I love this bag!