This is a big fly box. Suitable for your biggest saltwater flies, its great to have on-deck for any pattern the fish may want. It has a depth of 3.5" and measures 10"x12.75". It's not a box for your pocket, but it is a box to have with you on your boat at all times or in a backpack from shore. Its also a great box to store all your big flies in while tying. It has a high density, water resistant seal, stainless hinge pins, a clear lid, and thick foam.