Midges, Meat, and Mayflies – Oh My! Our triple layer design allows you to effectively hold a ton of different sized flies. The magnetic bottom handles all the small flies. The leaf has our time-tested slit blue foam that really grips the big, heavy stuff. The top is set up to hold and protect dozens of dry flies. It will take a beating. Fits easily in a fishing shirt at 6″ X 4″ X 1 5/8″.