We now have the new zipper rear bags and large rear bags from TAB Gear.

The large bags are just an upsized version of their extremely popular rear bag. Approximate size is 5.5" x 9" x 2"
http://www.693precision.com/TAB-Rear-Bag-009.htm


The zipper bags are built in both the small and large sizes with a zippered opening allowing you to use your choice of fill and firmness or leave it empty until it is needed. This is a great way to carry a spare rear bag without the size and weight.
http://www.693precision.com/TAB-Rear-Zipper-Bag-028.htm