K10, BO 20, K20, BO20, K20, BO20, K20, BO20, K10 (for a total of 160 stitches.) Each group of 20 sts will be worked separately. Put 3 groups of 20 onto stitch holders and work the current 20 sts. Turn work.
Row 1 : P20.
Row 2 : K20.
Row 3 : P20.
Row 4 : Ssk, k16, k2tog [18 sts].
Row 5 : P18.
Row 6 : K18.
Row 7 : P18.
Row 8 : SSK, k14, k2tog [16 sts].
Continue decreasing as set every 4th row until 6 sts remain.
Work 4 more rows in St st. Put these 6 st onto a stitch holder.
Work remaining 3 groups of 20 sts in the same manner. You will have 4 groups of 6 sts.
Finishing and Felting
Thread tapestry needle and graft the handles together.
Sew in and trim all the loose ends. [If you don't do this before felting, you may end up with a tangled mess!]
Fill washing machine with economy/half load, hot water, a small amount of detergent, a towel or a pair of jeans [something to provide some agitation in the wash] and the bag. Run the wash cycle, checking every 10 minutes until the bag has felted to desired consistency. You should no longer be able to see the stitch definition.
You may line the bag with fabric if desired.