Carrying extra mags, too much of a good thing is a bad thing?

After a conversation with a coworker on why I think it’s a bad idea to have things like punisher skulls on carry gunsThey then asked me how many extra mags was reasonably justifiable. I told him there’s no definitive answer but I carry one extra mag most of the timeI’m curious to know what others think about this via /r/CCW http://bit.ly/2Ub9ubY