I had 2 bags packed ready to go, one for labour/csec and 1st few days then another for about 5 extra days stay.
Mine were 4lb 11& 5 lb 10 and needed micro nappies for the wk we were in, t2 then moved up to sizes 1 (cos we had loads) and t1 had another 2 packs as she was really skinny.
First bag was mostly my stuff, toiletries, clothes, big pants, pads, breast pads, towel and thin big cardy type thing instead of a dressing gown, phone charger, book a decent hand cream as the sudden increase in hand washing and heat made them sore very quickly. 6 vests, 6 baby grows, hats, cardys. They struggled to maintain temps. Pack of nappies and wipes.
2 nd bag had more clothes, pants, pads for me. Then I worked on an average of 3 clothes change for them a day and packed for another 5 days. Average of 10 nappies each a day and packed some of those, (left rest in car), muslins, loads of snacks as I am starving for days afterwards, dilutable juice. Loads of change for coffee, magazines etc etc so you can go for a wander to stay mobile.