I carry a kel-tec .32 caliber on me most all the time. It weighs 6.6 ounces empty and just under ten ounces fully loaded. I often think it would be nice to have a .45 the same size, but I know "it ain't happenin". I would like to have a lot more on me if a difficult situation arose, but that is often times not possible. Yes, I have kits in my car, probably enough to start my own town, much less make it through the night, but the concept I have settled on is "can I make it home" with what I have on me. I commute 52 miles one way and have often thought could I walk home from work if I had to? I attend and am very active in a church 17 miles from home and again same thought.
The "can I make it home" concept made the biggest difference in planning a psk or altoids kit. When I started reading the forum several years ago (I recently, finally joined) I was overwhelmed with the contents of so many kits and so many ideas on preparedness. I could not narrow it down to one small kit. Now I feel confident that I could "make it home" with what I have on me. Yes, depending on the scenario, that could change, but if I decided to just get out and "hoof it" then I know I would see my wife and daughter in a couple of days.