With 1 strand each of A and AA held together, cast on 38 stitches. Work 4 rows in garter stitch. Change to 1 strand each of B and BB. Work 4 rows in garter stitch. Continue as established, working 4 rows of garter stitch in alternating colors until 26 stripes (104 rows) have been worked. Bind off all stitches.
STRAP – Make 2
With 1 strand each of A and B held together, cast on 42 stitches. Work 4 rows in garter stitch. Bind off all stitches.
Fold Bag in half with right sides together. With 1 strand of B, sew bottom and side seams, and sew straps to Bag. Weave in ends.