Well, yes, I usually do take tons of flies, and leave all the 'leftovers' behind, but a month of hard fishing can deplete even a large stock, and I thought I'd take down a tying kit, as well. Just seems like it would offer more flexibility, and since I'll be down for a month, I'm not so driven to spend every part of every day on the flats.
I've written up a list of parts for each of the dozen favorite flies, combined the lists, and figure I'd start from there.