Best things (sorry if these have been said):

Soft toilet paper (the wet ones are great!)
Mascara, lip gloss and tinted moisturiser (made me feel better!)
A really nice shower gel (OMG I loved my first shower after giving birth)
Comfy day clothes
Warm socks (had cold feet!)
Cold/hot pack
My own breast pump as the hospital ones not always available when I needed it
Snacks

Worst things:
Book (didn't feel like reading)
Too many clothes (didn't need half of what I took)

Yep had 2 bags too. One for labour with snacks/drink, bubs first outfit, camera, change of clothes for me and DH, mat pads, pg card and birth plan, music. Other bag had everything bub and I needed for hospital stay (ticked off list from hospital).