things i used: a rechargable 20,000 mAh power battery for USB, long USB changing cable for phone. (the outlets are all behind your hospital bed and mostly in use, much easier to just charge the phone off a battery that can be in/right next to your bed) nursing/delivery gown for after recovery, robe. shower shoes. personal water bottle/ soap/ toothbrush/ toothpaste/ mouthwash/ moisturizer/ coughdrops (hospital air is dry). depends (the mesh things didn't work for me at all 🤷🏻♀️) spare bag to take home supplies. (my ob made sure to impress upon me that thanks to covid everything left over in the room will be tossed, not reused for another patient. take the things home, you can always throw out later.) a take home outfit for bebe that worked with the carseat. miralax single dose packets. pens, paperwork packets for work/hospital. my advance directive/living will. if your spouse has a DSLR camera, bring it, you'll get much better pictures even than from the highest-end phone.
things i did not use: my kindle. one extra change of clothes. snacks.🤷🏻♀️the postpartum ward had a snack room and i had a lot of graham crackers and cheescake cups, and my spouse got me a lot of takeout since there are a bunch of good restaurants within walking distance. (room service actually got concerned that i hadn't ordered any food.)
GW will provide everything you need to take care of baby: swaddle blankets, caps, diapers, formula, flanges for the hospital pump, baby shampoo, tub, towels, washcloths.
oh, and bring a spare car key if you're driving. the valet misplaced ours when my spouse went home the first night to take care of the dogs. they sorted it out the next morning but fortunately i had another key. (also don't hand over the house keys along with the car key!)
on the list of things i wish i'd known: just how busy congested the parking/dropoff lane was at 0600. i had to traffic direct to even get us in the lane, and then a police officer decided to use it as a cut-through and was laying on his horn and saying "MPD! get out of the way!" as 9-months pregnant me was trying to get me and my bags out of the car. i barely refrained from flipping him off (i just threw up both hands) and hospital staff went over to his car and was like "i don't care who you are, cut it out."