Smith Creek Middle Fork 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 high spec zinger w/rotating pin attachment & lanyard connector Smith Creek quality. Custom formulated UV resistant body & high impact plastic Patented No. 613464. Worldwide patents pending