DIM: while folded 5.5" x 3.5" x .5"
main window: 6.125" x 4.75"
small window: 2.25" x 3.5"
For those who could use a quick no hands-mission cheat sheet, you might want to look into this lil guy. The strap sizing and orientation is made for the left arm, but one can wear it on their right arm with the flap opening towards the body rather than away. All connections and seals are done with velcro which includes the straps and the main clear vinyl opening. Although the space isn't vast, the main pocket works well for holding a small map. Elastic is sewn onto the edge of the flap pannel to allow a place to put 2 pens or pencils. An extra smaller swing-away clear vinyl pocket is attached which can be good for quick notes or HVT pictures. Since the pannel wraps around your wrist, the map doesn't lay flat, but this didn't seem to be too big of an issue for usage.