I presume you mean what type of box to store your flies in.
For most of my flies I like a Sci Angler's style box. Doesn't have to be Sci Anglers per se. Cabelas makes a nice box very similar and a lot cheaper. I like the rippled/flat style.
For lager flies there's a thicker box (don't know the brand name) that works out better without crushing the flies. And you can always use a Plano type box with long compartments. Just put the flies in plastic sleeves first.
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