I used the flap size to cut the fabric for the 2 flaps and again I cut the fusible batting 1/2 inch shorter and narrower than the flaps and ironed it on.
This is what you should have at this point.
Now sew the left, right and bottom of the crayon pocket to the front of the cover. I left the top open and put a small blank book that I made in there.
Now back to the cover.
On the outside, back you will pin the handles and loop. I just estimated the length of the handles and cut them the same size. I used a hair rubber band for my loop. Now place the inside flap with right sides together over this and seam up this edge being sure to catch the handles and the loop in the seam. I back stitched over the handles and loop several times to add some security.