I am a college student who needed a bigger, sturdier bag to hold everything.  And I mean EVERYTHING!  On a daily basis I carry one huge textbook, 2 medium textbooks, 3-4 notebooks, including a file folder for each notebook, laptop, power cord, graphing calculator, pen/pencil organizer, wallet, phone, gum, mints, and there's still plenty of room for more.  When it's full, it weighs 25lbs.  There is a mesh pocket on the strap for you phone and also a mesh pocket on the side for a 20oz pop/water bottle.  I don't use the cell phone pocket, it seems to be really narrow and the elastic is really tight.  I have no issues with the straps, took me a little to get used to since I haven't worn a backpack in years, but they're very padded and comfortable.  The back is well padded as well.  There's a laptop sleeve and a tablet sleeve if you have both.  The zippers are good quality, slightly heavy-duty.  None of the previous reviews mentioned the construction of the bottom of the bag so I was a little unsure of my purchase.  The main compartment is well padded/reinforced.  The secondary compartment is not, but I just put lighter stuff in there and it works fine.  Would recommend this to anyone who has to carry a little or a lot, it does the job!!!  Great product, color was better then the picture too.  I would buy this again, but I don't think it's going to wear out soon.