The NRS Chart Case LARGE was designed with the paddler in mind. They misnamed the larger sizes we consider them chart cases not map cases! The stiff sides make the case easier to handle and charts easier to read. You'll need this size when using a folded NOAA chart. Finally, the corner-mounted holes make it easily attachable to canoe, kayak or raft. Image is not to scale. 

-interior dimensions 18" L x 15"W

-outside dimension 21 5/8" L x 16 7/8" W

-Protects against rain or waves

-Attaches to boat, deck bag or backpack

-Seals easier than standard press lock closures

-Floats if lost overboard