I'm not really looking for a "diaper" bag because DD is out of diapers. What I would like to find is a bag for an almost 4 year old that is big enough for park necessities (including a change of clothes, sunscreen, etc) but small enough I can toss in the basket under a Maclaren Quest when we don't need anything. I really want to cut back on the amoung of crap we carry into the parks with us. But with a child her age there are still things we NEED. Any good bag suggestions?