Leaks of course. But also, I sometimes worry people can smell me (even if its really in my head.) Going out in an already wet diaper makes me so nervous that I actually am probably going to end up wasting a diaper because I put it on, used it once and then realized... I have to be at work in four hours! I don't like going out in an already wet diaper. I get a bit paranoid. Maybe it's in my head.
That's my biggest fear as well is kids finding out that an adult is wearing a diaper and 2nd is dogs sniffing out the general area of where the diaper is positionedThe biggest issue I worry about is kids calling me out. Kids have no discretion. If they see it, you'll hear about it!
I'm not worried about leaks, I'm worried about having an auto accident and being transported to the hospital! That's a pretty remote thing to worry about, I know ... but with my luck, it would happen to me.