One thing you have to be when biking with kids is prepared (just like in Boy Scouts).
Last weekend we went out with the grandaughter in the trailer. We stopped for ice cream, and as she was walking around eating, she stopped and I noticed her diaper was down around her ankles. The sticky stuff that holds it on had come off.
My SO tried to put it back together, but once that stuff comes apart that's it, it won't stick anymore.
Enter my seat bag. Among other things, I carry some duct tape rolled around a pencil. (Mike also mentioned this in an earlier thread). I was able to cut some off and repair the diaper, and we continued on our way.
Now nobody can kid me for carrying all that stuff around all the time!
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"...perhaps the world needs a little more Canada" - Jean Chretian, 2003.