I start the year with approx. 500 jigs in one fly box. It's the 8" by about 4" variety with wave foam on both sides. The jigs weigh it down, so I doubt it will float, but with less jigs it use to float.
The wave foam is a must if you want to ba able to put enough in the box, and still get them out. I use my hemos usualy to get them out.