Assemble Casings for 19x15x5" Bag
1. Fold a blue polka dot 3-1/2x39-1/2" strip in half widthwise and sew together across short ends to make a tube (Diagram 1). Press seam open.
2. Turn tube to right side. Center seam and press tube flat. Fold tube in half lengthwise to make a 1-3/4x19-1/2" casing (Diagram 1).
3. Repeat steps 1 and 2 to make two casings total.