I keep my bass streamers in a wide range of sizes. On the large end are flies with lots of marabou and a large profile to move vigorously in the water. In the mid range would be fox fur baitfish patterns with a thin, but long profiles. Finally, I keep several different types of small zonker style flies. I use both rabbit and squirrel zonkers. However, I am particularly fond of squirrel for micro streamers for flies int he size 10 and 12 range.