Aloha Ors,
Are you guys using disposable or cloth diapers. I find that your chaoice will make a difference in many ways. Cloth diapers will require more carrying capacity as you will also need your diaper covers and the diapers themselves are more bulky.
Despite that, we went the way of the cloth diaper. Kids seem to potty train faster because they can feel the wetness. Also they get changed faster after their, uh, delivery.
Probably even more important with boys as my wife was telling me she read somewhere that disposables can increase the likelihood of testicular cancer. I don't know if this is true or not. But we really didn't find the cloth diapers too inconvenient.