With crystal clear, durable polycarbonate lids, this double sided waterproof fly box fits in a jacket pocket and has long-lasting silicone inserts. Our silicone fly boxes feature an easy new guide system, allowing flies to be more easily inserted and removed without sacrificing a secure hold. (The silicone is molded in one process with one die, increasing its durability and life over traditional foam boxes and cut silicone.) Other features include stainless steel hinge pins and a flush latch that won't catch when sliding into a jacket pocket or bag. The boxes can carry 98 flies for the midge, 220 for the large and a whopping 312 for the X-large size.