Introducing the Pocket Water Fly Box. How often do you end up fishing out of the plastic container you picked up at the local fly shop? The Pocket Water Fly Box is made to be your easily accessible, daily go-to. Tailored to easily rotate the flies you plan on using most for that day’s trip. At just under 3×6 inches, the Pocket Water fits conveniently in your shirt pocket, waders, and anywhere else you may want to put it!