Print front and back pieces on cardstock.
Cut around the outside lines, fold on the inside lines.
Apply glue to side glue tabs (white) and attach the pieces together.
Fold up bottom flaps.
Apply glue to a little more than 1/2 of one of the bottom flaps (shown in green).
And glue together.
Fold over the long flap (top) and glue Velcro on flap for a closure.