There are good lists if you Google but the one thing I would say is an (extra long?) Phone charger, I had a csection and was waiting for hours before and afterwards wanted to text everyone and my cable barely reached the bed.
My full list if it's helpful:
hospital notes
3 changes of clothes
2 or 3 nursing vests/ bras
breast pads and nipple cream
maternity pads
knickers
washbag
toothbrush,
hairbrush, Dry shampoo
flannel,
soap,
lip balm,
deodorant,
hair ties
and other toiletries
towels
tablet- podcasts, films, headphones, charger
loose-fitting top
Cardi
outfit to wear home
snacks and drinks
extra pillow
Medicine
Phone, charger, battery pack
Slippers
BABY:
bodysuits, vests and sleepsuits
an outfit for going home in
a hat, scratch mittens and socks or booties
nappies, nappy bags, water wipes
muslin squares
a pram suit if cold
a shawl or blanket
I have 3x black/ grey thin trousers and 3x black/ grey thin long sleeve tops, that way it all fits together. I bought massive sizes from a cheap catalogue.
All mine is in packing cubes inside a square bag (I think they call them weekend bags?) And then a separate one with packing cubes in for baby.
Hope that helps and good luck!