Is this backpack good for carrying a laptop?

Yes. It has a separate padded velour laptop compartment inside, plus a mesh organizer pocket for cables and small items. The 18 x 11.5 inch body fits most 15-inch laptops.

Does it fit under an airplane seat or on a carry-on?

It is 18 inches tall, which is within the usual personal-item limit for most airlines. The back sleeve slides over a carry-on handle so it rides on your luggage.

What is the shell made of?

The exterior is 100% PVC. That makes it easy to wipe clean and holds the graphic print well, but it is stiffer and less breathable against your back than nylon or canvas.

How does it compare with a plain commuter backpack?

It adds a velour sunglass compartment and a luggage sleeve that many plain daypacks lack, and the print is the main draw. Plain nylon packs are lighter, more breathable and more discreet.

What compartments does it have?

A front zipper pocket, side pockets, a zippered stash pocket, a velour sunglass compartment, a velour laptop compartment and an interior mesh organizer pocket.