Farmer's Market Bag

I’m just starting the Farmer’s Market Bag in Weekend Knitting. When making the base, do I use all of the double pointed needles…or just 2? I’m casting on 13 sts and making 59 rows. After I cast these off I will then pick up sts…but back to the question of all of the double pointed needles or just 2.

You can fit 13 sts on one needle, so you would just use 2 dpns.