CustomTankBags by LindaT.

Rally Book

These are very water resistant cases that can hold rally instructions or maps. It is sized to hold a storage clip board like this one but could hold an atlas or anything that you might want to be able to reference while riding. It's dimensions are 13¼ x 10¼ x 2¼ inches. The face is clear vinyl and has been sealed to prevent water from seeping in.

It has a swivel clip at the top and Velcro® on the back in any pattern necessary to attach to a tankbag or tank bra.

Rally book
Side View
Interior showing two pockets: the larger is accessed from the side and will hold 8½ by 11 inch paper. The smaller one will also hold full sized sheets.
With clipboard

The clipboard is an option.  If you wish to supply your own clipboard, just let me know the dimensions and I will size the Rally Book appropriately. I also sell clear vinyl pages with a zipper closure for those who'd like to water protect each page. The the price list for pricing.