I usually carry my 640 and two speedstrips on me. The 640 has 5 .357 Speer Short Barrel GD's in it and the speedstrips carry the same bullet in the .38 special variety. That's so if I need my back up gun, another j frame,(637), they will work in either gun. Also, two speedloaders in my off body bag.

I recognize the fact that hopefully I'll never need them, but they make me feel better never the less!