I've one box for dry-flies.
Another for boobies.
Another for lures.
And one containing both buzzers and nymphs.
And a small box for wet flies.
And several empty boxes, some containing spares and flies I'm unlikely to use (salmon and sea-trout etc which came in collections I won on ebay).
But I use less than a dozen flies regularly, so the boxes mostly just take up space in my bag, whilst I mainly use those flies residing on my waistcoat patch
Just don't ask about my float collections, or the boxes of jerkbaits and spoons etc, or my boat leads, beach casting leads etc!