When I leave the house, I want to carry as few things as possible. With two kids, this may seem like a huge challenge, but over the past two years I have almost perfected this routine. For my kids, I need a change of clothes for my tot (who tends to vomit in the car) and two changes of clothes for my newborn (who has leaked through every brand of diaper we have tried.) For myself, I just need my keys, phone, and credit cards. I don't often carry ...