For the more epic rides into the unknown,You might want to consider the new map case from Phantom Pack Systems.
Designed to carry standard size maps,GPS units or smartphones.
Map Case features;
-Hypalon bottom for durability.
-Semi rigid carbon fiber side panels for added stability.
-X-pac Vx-21 fabric lining and top.
-Transparent map window is made for UV protected poly-vinyl.
-Velcro closure for map.
-Dual YKK water resistant zippers and sliders.
-Open one zip for quick grabs,Or both for full excess to the main storage compartment.
-Mesh storage pocket inside.
Phantom Pack Map Case;Truly a great way to carry your map,Or just to increase your load carrying ability for the longer rides.
weight-7.45oz. 212g approx.
Olive green/black(Shown below)