From the Knit Picks Website:
Felted tote bags in two sizes keep your bottlescool and protect the contents. The larger bag accommodates a bottle of wine, craft tools or other treasures. The smaller bag is sized to carry a water bottle. These knit up quickly in the round on circular needles with simple garter and stockinette stitches. Knit Picks Shamrock and Wool of the Andes yarns felt beautifully and easily. Solid colors may be embellished with needle felting. Both bags make nice gifts for friends on the go.

Needles:
Size 13 (9mm): 16” circular or DPNs