Well this is baby 3 so I'm feeling well practiced! I do a separate one for me, the baby, and then my older dc.
Me: 2 feeding bras, PJs, old shirts of DHs, flip flops, 6 pairs big pants, 4 packs maternity pads, breast pads, small wash kit (+make up if you like), towel, clothes to go home, a few long lasting snacks, water in refillable sports bottle, juggling balls, maternity ball + pump (if not provided at hospital) camera, phone + charger, little puzzle book or something and pen.
Keep the stuff you'll want right after birth (pants/bras, pads) at the top.
Baby: 4x babygros, 4x vest, 2x hat, 2x cardian, 1xsnowsuit for car home if cold, 2x cellular blanket, 2x sheet/swaddle wrap. Presents from baby to older dc.
Older kids: change of clothes each, PJs each, special toy each, something nice for the babysitter!