diaper bag suggestions?

Katie
My son will be 2 a week before I'm due and I really want to say he will be potty trained but I have a feeling that won't happen lol so I'm wondering what kinds of diaper bags do you guys use for 2 small children?  Even if I do get him potty trained before my next baby is born I'm going to need room for extra clothes and stuff. I was thinking the Ju ju be be prepared but I'm not sure... help!?! Thanks!!