Ultra Clear Anglers Image Fly Boxes now available in with a silicone insert. The small box features 77 slits and is a great size to go in a shirt pocket. The medium box features 108 slits; it fits in a shirt pocket and easily fits into your vest or chest pack. The large box has 177 slits. This larger box has is great for an expanded selection of midges, nymphs, and dries.