Smith Creek Streamer Fly Patch Double Sided - Wearable Open Fly Box. Extreme access. Load and leave fly boxes in camp. Holds flies securely. Ribs protect against damage & rub-offs. Adaptable - Zinger, Lanyard, D-Ring, or Pocket. Includes a stainless-steel attachment cable. Smith Creek quality. Custom formulated UV resistant body & high impact plastic. Patented No. 613464. USA & Worldwide patents pending.