Diaper bag. & I use the diaper bag as my purse lol. More convenient than carrying two big bags around.
I haven't had my baby yet, but I was just planning on carrying around my diaper bag and keeping my wallet in there with it & some chapstick. Instead of carrying a purse & the diaper bag.
I use a diaper bag that looks like a purse. Burlington coat factory had really nice ones for cheap. I always get complimented on mine because I use it as both at the same time.