GameMastery Flip-Mat

From the publisher's website: The Steel Sqwire Flip-Mat is designed to make your game portable & affordable. It is constructed of durable laminated card stock (~70 lb paper—comparable to that of a restaurant menu). The Flip-Mat is 24" by 30", and it quickly and conveniently folds to a size slightly smaller than a sheet of notebook paper: 8" by 10". One side is printed with 1" squares; on the Flip side, there are 1" hexes. When mapping out your adventures you will no longer have to worry about the markers that you or your players may be traveling with. The Flip-Mat can handle wet-erase, dry-erase, and permanent markers. This gaming aid is great for conventions, new gamers, or Game Masters who want multiple mats to pre-draw separate encounters.