What to pack in a hospital bag when I'm not the one giving birth?

My husband and I are expecting twins via a surrogate. The twins are due late March. I have given birth before as I have a sixteen year old daughter so I know to take things like onesies, cloth nappies, scratch mittens, bottles, formula, etc but I'm not sure what else to pack in the hospital bag. Should I take some things with me for the surrogate? Should I pack the usual stuff in the bag that I would take if I was the one giving birth?