I have the InCase Medium Messenger bag
I have the Medium version of the same bag. I think it's pretty terrific. Lots of pockets internally, lots of room. Comfortable shoulder strap with very comfortable pad that slides nicely. Shoulder strap has super-easy length adjuster -- a huge flip-up friction lock that you can adjust even while wearing the bag. Huge internal main compartment, which was key for me. Most bags only open 3 inches, but the InCase Medium Messenger is 7.5" deep. (The Large is 9" deep.) Nice faux-fur lined computer compartment at the back -- it's flexible, not hard, making the bag MUCH more comfortable on your back, while still offering reasonably good padding. Water resistant, I guess, but a heavy rain will penetrate it. Reasonably good looking, especially if you clip the front-flap clips instead of leaving them dangling. And it has terrific, huge velcro strips for the main front flap, plus two adjustable clips, so it's great at staying closed while still being easy to open.
I can carry a MacBook Air, all its accessories, plus tons of other stuff, including 2 pairs of shoes/sneakers, spare t-shirts, spiral notebooks, collapsible umbrella, water bottle (pocket is inside), and a whole range of odds and ends. There are 4 or 5 pen pockets, too, which I like.
Only 3 minor drawbacks for me. (a) There is no back outside pocket, so you always have to lift the flap to deal with stuff. (b) The padded computer compartment has an unpadded seam along the entire rear bottom edge, where I guess the padding-sheets meet. My MacBook Air is SO narrow that it always slipped into that tiny seam, meaning it had zero bump protection along the bottom. Dropping the bag from even a couple inches was bad. So I added my own U-shaped padding. Kind of silly to pad the padding, but it was necessary and solved the problem. (c) Apart from the computer compartment in the back and the numerous pockets in the front, the interior is one giant compartment. I wish there were a simple cloth divider just in front of the computer compartment, making a second shallow full-width compartment for paper documents, to keep them separate from all my other junk in the main compartment.
I've been using various bags for many years. This is my favorite so far.
