In my family, all childred had to wear just in case diapers until we were 8 whenever we were going to be in the car for more than 2 hours, going to be away from the house for more than 4 hours (at the firworks, a fair, etc.), or if we wet the bed the night before. After we were 8, we had to keep our just in case diaper dry 5 times before we did not have to wear them again. If we were out of just in case diapers and had an accident, we had to go back to diapers again until we were dry for 5 times again. Until i was 10, the longest I went was 4 times. When I turned 12, I started weting the bed again so I was back to diapers at night again, but I did not have to wear them during the day until I started having daytime accidents again.
The worst part of just in case diapers was having the diaper put on. I didn't mind wearing it so much as my brother and sisters knowing that I had to wear them. We had to go get our diapers and bring them to mom to have them put on until we were 10 and could show we could put them on without them leaking.