The BarPack is a folding mapcase that is about 6" X 10". It clips to your handlebar with quick-release clips. But the difference is that it unfolds to 4 times the size, showing an inside map window 12" X 18". It shows 6 panels of a "National Forest map."
Inside, are some thin pockets for a pen, and notepad and such.
Includes one MK-1 Mounting Kit. If you want to move the BarPack Mapcase between bikes, order extra Mounting Kits - MK-1 or MK-2