I got this for my daughter at her request because she has so much homework she needed multiple bags to carry her books.  I had my doubts but when the bag arrived it was every bit as roomy as she said it would be.  Amazing how much fits in here. And sensible number and placement of compartments to separate things.  She fits ALL her text books in here and still has room.  Sometimes the thing feels like about 50 pounds when I lift it (worry about her back, but I blame the school, not the bag).  If you need a lot of room, this is the bag.  For her, she also likes the look of it. Durability.  Have been using it daily for months now. Holding up well.  The flexible netted side pockets have since been snagged and have torn a little, but I have seen that with this material on any bag it's on.  Still holds water bottles just fine.  I wouldn't have put my keys or phone on the side even when it was new.