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Has it happened to you yet?  You are out somewhere with your baby, thinking that everything is cool, when all of a sudden he unloads and fills his diaper like he's never done before.  When this happens it is a good think you have your toolkit (a.k.a. diaper bag) handy.  

Though mom may be the one who puts the necessary things together, it is a good idea for you to do your part in restocking it.  It needs to happen regularly.  Check out some ideas for the diaper bag at newdadmanual.ca.

What other things would you add?