In the past I have tended to only carry 3-6 of a given pattern, usually in no more than 2 sizes. Lately, I have begun to carry 3-6 of a given size and a full range of sizes (depending on the fly) for at least my most commonly used flies. This includes a few caddis variations, BWO, and Adams which covers a lot of my trout fishing.

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Fish more, work less!