Stone Creek Flip Open Fly Box These simple Clam Shell style fly boxes come in two styles 6 compartment or 10 Compartment. 6 Compartment: One side has 1 x large compartment while the other has 3 x small and 2 x medium compartments. Clear only. 10 Compartment: Each side has 2 x medium and 3 x small compartments. Grey only. One Size: 4 x 2.5 x 1.25