If you can, call the hospital you plan on going to or ask someone you know that has been there recently(it can change). They will be able to give you a list of what they provide so you know what you don't have to pack.
I haven't packed yet, because I have a bit to go yet. I like to make lists though, so this is what I have so far. I figure it gives me an idea of what to grab as I go and add on if need be as well:
-Chargers- IPAD, phone, and camera
-Devices- IPAD, phone, and camera
-Vending machine money (Meals, a small assortment of snacks, and drinks are provided for the most part, but this is a just in case)
-For me- Socks, slippers, 2 days worth of comfy clothes, a nightgown, bra's, undies, basic makeup, contacts/glasses, toothbrush/toothpaste, shampoo/conditioner as the ones they supply aren't great, and nipple cream. Hospital provides- gown, slippers socks, mesh undies, cooling pads, water squirter, towels, toilletries, etc.
-For hubby- 3 days worth of clothing, underwear, socks, tylenol and toothpaste/toothbrush
-For baby- Coming home outfit, 2 sleep gowns, 1 blanket, binky (hospital doesn't provide), a few diapers, pack of wipes, and car seat. Hospital provides- diapers, wipes, gowns, blankets, lotion, bath soap, and basically all the essentials.