The B-0 SLIM is obviously the thinnest possible FLEX SYSTEM configuration. We sometimes call this bag "The iPad bag" because it works so well as an ultra-thin computing and personal bag.
The B-0 is simply the POCKET CAP FRONT and the FLAT CAP REAR modules zipped together. It has no definable interior storage dimensions since it is just two End Caps put right against each other, but the flexible nature of the parts allows one-half inch to three-quarters inch of flat items to fit inside between the modules.
The iPad (or other tablet) is most commonly stored inside the long slip pocket on the back of the FLAT CAP REAR, and then the space between the two modules has the capacity to store a 13" Ultrabook laptop or a thin stack of Manila folders for documents, or a magazine or two. So it is possible to carry a thin laptop AND an iPad with this configuration.
Slim Handle Kit
Adapter Loop (qty 2)
D3 Clip (qty 4)
NOTE: Does not include a Main Handle (not necessary)
Interior: 13.5" tall, 10.0" wide, zero inches deep. (34cm x 25cm x 0.0cm)
Exterior: 14.0" tall, 10.5" wide, 1.75" deep. (36cm x 27cm x 4.5cm)
Keep in mind that the bag material is flexible, so the size of the interior storage may be able to "stretch" out just a bit in one direction or another. Also keep in mind that over-stuffing your bag can cause seam or material failure, and this is not covered by warranty.