Map Pouch

The use of (locator) maps is really great when navigation a world - it lets you easily find marked places with a map in an itemframe, and other players. Also, it is a very nice way to visualize the explored terrain (map room with copied maps in item frames). A downside is however the amount of maps you will have to carry with you when strolling around, blocking your inventory. Would it not be great to have a map-pouch, which you maybe hold in your offhand. It could be loaded with maps from your collection, and automatically selects the right one when strolling. Maybe even an empty one if in unexplored terrain, to continue exploration. 54 slots per pouch?