I waited a little longer with my first and will be doing mine at about 36 weeks with this one. I knew that I'd keep changing stuff out and driving myself crazy, but it doesn't really matter when you do it.
Comfortable clothing, an outfit for baby to come home in, socks and mittens, some diapers and wipes, pads and undies for yourself, general hygiene supplies (toothbrush, deodorant, etc). I'm a minimalist but if there's anything you want during labor to listen to or watch, pack it in there.
I will be sure to get some
It's always good to be prepared :) One thing I would recommend packing is chap stick! All the labored breathing makes your lips very chapped.