Some kind of device for listening to music is something I wish I would have had with my four previous pregnancies. Now that I have an awesome JBL portable speaker that works with my phone abd Spotify, I am for sure going to be using that during labor to play calming music like Celtic Woman, Enya, and nature sounds. Also, aromatherapeutic oils like lavender and rosemary for massage and to calm myself. I am planning on a drug free birth like my last birth was, and so both of these will be helpful. Also, maybe a couple tennis balls for your SO to give your back a massage with - I hear this helps a lot. Personal toiletries are a must, like soap, shampoo, toothbrush, toothpaste and etc. And don't forget to bring snacks and drinks.