A waterproof and crush-proof box that is designed to carry a ton of flies! Total capacity will vary- but figure 60+ articulated streamers or 120+ standard streamers or 400+ dry flies/nymphs should fit. - Each side of the fly box is lined with a heavy duty slit foam measuring about 9 X 6.5 inches - 1/4" foam will hold a ton of flies securely. - Plan D boxes are waterproof and vented with a waterproof membrane to keep box from ever vacuuming shut. - 3M adhesive keeps it all in place. - Marine grade 316 stainless steel hinges. You can double your capacity by adding an XL Swing Leaf Foam insert - Approximate external dimensions are 9.5" (length) X 8" (height) X 3" (width)