Oh and of course a going home outfit
Heavy flow pads, ur regular toiletries to shower with, a nightgown or comfy pajamas, socks, granny undies u dont mind ruining, breast pads, chapstick, snacks, camera, phone chargers, i bring an extra pillow, hmmmmm nursing bra, and maybe a notepad for anything u need to jot down thats important info when ur discharged.
I'm currently doing my bag too. I've read that you should basically take what you would on a trip. Clothes (shirts, pants, underwear, slip resistant socks, maybe a robe), entertainment (something to read and camera), bathroom items, and also regular pads and breast pads.