This handy accessory gives you flexibility in where you put your fly patch on your pack. It is designed to interface with Umpqua's Zero Sweep 2 line of packs and bags via the Molle chain system, but will also attach to a loop or D-ring on virtually any pack or bag. It includes the Zero Sweep Fly Patch, which is designed to hold flies securely while minimizing potential for line to snag on the pack during casting.