Part Two: Boxing
With the exterior fabric, take the two cuts of 15"x18" and sew around three sides (15 - 18 - 15). Seam allowance should be 1/4" to 3/8", just be consistent. Be sure to secure the beginning and end by sewing back & forth a few times.
With the interior fabric, take the two cuts of 15"x18" and sew around three sides (15 - 18 - 15) BUT leave a hole around 3" wide in the middle of the 18" length to turn the bag.
Press both pieces FLAT.
Pinch the corner and put seams together. Flatten out the corner on a grid and draw a diagonal line (My grid is 0.5", so measure your diagonal at 2" on each side).
Pin to keep in place, then take to sewing machine and sew along the line.
Cut excess off.
Do this for both corners on interior and exterior fabrics.
Press what seams you can.
This is what the corners will look like now:
Parts 3, 4 & 5 can be found here
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