With A, cast on 28 stitches.
Row 1: Knit.
Row 2: Purl.
Repeat Rows 1 and 2 until piece measures about 18 in. (46 cm) from beginning.
LONG SIDES (make 2)
With A, cast on 38 stitches. Knit 13 rows. Change to B and knit 1 row. Bind off.
SHORT SIDES (make 2)
With A, cast on 26 stitches. Knit 13 rows. Change to B and knit 1 row. Bind off.
With smooth (knit) side on outside, fold Base in half to make a 6 x 9 in. (15 x 23 cm) piece. Sew together along 2 sides, then insert cardboard or plastic canvas and sew remaining side closed.
Sew cast-on edges of Sides to Base. Cut 8 lengths of B and sew one length to both top corners of each Side. Tie B lengths together to shape Holder. Weave in ends.