Orvis Ultralight Foam Fly Box - Made of ultralight foam, this floating fly box is a perfect option for days on the water. Ultralight floating fly box made of molded foam with micro slits in the interior. This allows flies to be backed in and protects the foam unlike ordinary foam boxes. Flies hold in place much better and if dropped in the water, the floating box is easily retrievable. Excellent weight reduction in pack or vest.