This is the rear bag on the current B10 Classic. It is 13.5” x 10.5” x 3”. Holds Charts, iPads and more.
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This is the rear portion of all of the standard configurations. It is designed primarily to be a document bag. But, of course, it is a good size to hold all sorts of different stuff like a change of clothes, your lunch, a laptop and/or an iPad, or simply some additional gear that you need to carry.
The Rear Bag is 13.5” x 10.5” x 3.5” on the outside. The main compartment is 13" tall, 10" wide and 3.0" deep on the inside. (And remember, it is a soft bag so it can expand slightly in every direction.)
NOTE: The FLEX modules WILL NOT WORK with (will not zip onto) any older BrightLine Bag. The zippers had to be of a different type to allow this modularity concept to work. The Rear Bag can attach to all of the FLEX System modules except the Rear End Cap.
NOTE ALSO: The Rear Bag is one-directional (as are ALL of the FLEX System modules). It is always rear-facing. That means that it can only be zipped onto the REAR SURFACE of any module. You cannot zip a Rear Bag onto both the front and the rear of a center section. You must use a Front Bag or a Front End Cap on the FRONT SURFACE of any module.
There are zero FLEX-Mount pocket stations on the outside of the Rear Bag. (It's a little too narrow.)
There is a simple 1" nylon strap on the top of the bag to act as a basic handle if you need to grab the bag by itself. There are also two Switch Snap quick release buckles, one on each side of the bag, which allow you to attach a Main Handle or a Shoulder Strap.
The Rear Bag does not come with a Main Handle or a Shoulder Strap.
All of the FLEX modules will fit a 13 inch laptop. Including the 13 inch MacBook and 13 inch MacBook Air. These modules were not designed to be full-blown laptop-carrying modules, so the padding is adequate, but not much more than that.
The interior of the main compartment is gray so that easy to see all the stuff inside.
On the interior, the Rear Bag has two narrow pockets that are vertically-oriented over on the right side-wall of the bag. The lower of these two pockets is larger and is a great place to store extra pens and markers and eyeglasses. This pocket is also accessible from the outside of the bag through a zipper found on the outer sidewall of the bag. The uppermost of these two pockets is smaller and it's a great place to store spare batteries, ear plugs, or other small items.
There are three pockets on the outer surface of the rear panel. One main flat pocket that covers the full width and height of the rear panel that is great for storing your iPad or other tablet computer, a thin stack of documents or a magazine or two. This primary pocket is accessed from the top and has a cover flap that is secured with Velcro. There is a second flat pocket on the outside of the first one that is somewhat smaller that is accessed through a vertical zipper on the rear panel. This is a great place to store a few smaller documents such as some travel documents or receipts etc. And finally there is a third flat half pipe slip pocket that acts as a great place to store a couple of basic documents that you want to have easy access to such as today's checklists or your boarding pass etc.
The bottom of the bag has two plastic "skid plates" to help keep the bottom of the bag off the ground.
The Rear Bag is not intended to be carried by itself without anything zipped onto its rear surface. The front exterior surface of the Rear Bag is just a "naked" panel with no pockets. With nothing attached to this surface, the separation zipper (the main zipper that allows other FLEX modules to be zipped on) ends up being rather exposed because it is just "hanging off" the front side of the bag. (Plus it just plain looks bad.) If you plan to carry the Rear Bag by itself you should make sure you have a Front End Cap available as part of your FLEX system. This will do several things all at once:  It will "complete" the rear surface of the bag making it look finished and professional.  It will protect the separation zipper by closing it off.  And you will get all the extra storage that comes from the pockets on the Front End Cap itself, as well as the space between the Front End Cap and the Rear Bag.
The rear panel of the Rear Bag is not detachable. It is permanently connected to the Rear Bag. It is easy to think that this is the same piece as the Rear End Cap. But they are different. This rear panel of the Rear Bag is permanently attached. The Rear End Cap Is a separate piece that can be attached to (and completely detached from) the rear surface of any of the other modules of the FLEX System.