Since I have started using ultra-thin titanium/nickel alloy leaders that are stretchable and highly kink resistant, I don't even consider fishing without a leader. The swivels generally wear out before these leaders ever kink.
If you can tie a trilene knot in fishing line you can tie your own leaders with titanium. It's a little weird to work with at first really quite simple. 25lb test is my fave. I'll have a few leaders at Copia for those who will be there.

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I do not use leaders when jigging but do use a snap swivel with jig spinners to prevent line twist.