I picked up a OGIO Stealth Tail Bag last week at the local motorcycle emporium. Nice bag... to me it looks as though it could have been made for the CBR. I used an aluminum climbing carabiner(about $5.00 at REI) to connect the sewn loop ends of the four straps under the pillion seat. Un-clip the quick release buckles to remove the bag from the bike, and the straps stay in place under the seat.
The main interior compartment actually measures 12"Lx10"Wx5"H with 2.5" additional height expanded, plus the two side compartments, which measure 10"x4"x1" each, and the top pocket, which measures 10"x9". The side compartments feature wedge shaped closed cell foam inserts, which stiffen the whole bag structure, and at the same time gives the bag its "stealthy" look. It also has a rain hood, which is stored in its own zippered pocket. In the main compartment there is a clip to keep your keys secure. The bottom of the bag has a rubberized pad to protect paint, which also helps to grip the surface of the seat. With the straps cinched up tight, the bag is very secure on the bike.
This tail bag is ideal for carrying the basic necessities on a long day ride, or for carrying the brown bag lunch when commuting to work. As far as carrying a notebook computer, anything much bigger than a 13" MacBook isn't going to fit into this bag. All in all, I think the OGIO Stealth tail bag is a good value and size for the money. Maybe worth noting is that this product is made in Vietnam, not China. The tail bag has a lifetime warranty in the USA (30 years in the EU).
I paid $69.95 plus sales tax, at the local dealer. Online selling prices seem to be about the same, plus shipping.
All in all, this is a really nice tailbag... and well worth its price, IMO.