I purchased this item for my 8th grader.  It arrived earlier than expected and the packaging was very secure.

The handle, binding, zippers and wheels all appeared to be of excellent quality.  The cavity is very large;  it fits a textbook, 2" binder, pencil pouch plus room for thin or small items.  There are 2 smaller compartments; one fits gym clothes (rolled) and the other holds keys, money, etc.  There are 2 bonuses:  1.  the interior cavity has a lining and 2.  the backpack straps fit nicely in a casing so they don't get caught in the wheels (very smart design).

It has been in use for 4 weeks now and the quality is still maintained.  The compartments have been stuffed with school supplies, rolled on various outdoor surfaces and has been weathered in several rains.  It met my expectations and I would highly recommend this product.

UPDATED ON 2/22/2013.  My 8th grader has been using this roller backpack for school for 6 months now.  Just now, the bottom material is starting to thin-out.  I'm still very happy though because of the way this bag is dragged and tossed, all the outer construction is still very good.  The handles, zippers, fabric and wheels are still in very good shape and working well.

Still would highly recommend this roller bag after 6 months of daily and rigorous use.