Cardboard (cardboard with white on one side works best)
1 Ziploc Storage Bag
Dry Erase Markers
Step 1: Cut your Cardboard
Mark the dimensions 8.5" x 11" -the size of normal printer paper.
After cutting your cardboard with an Xacto Knife or similar cardboard cutter, if you are using cardboard that's brown on both sides, glue or tape a piece of blank white printer paper to one side of the cardboard.