I have put a mattress protector on my bed... But you really don't need anything if you will be expecting someone to turn up with everything. Cord can stay intact, everyone has towels, you have your breasts and I assume you will have baby blankets and nappies... *shrugs*

Things that I have in my pack are;
Mirror
Towels
Scissors
Cord ties
Homeopathic herbs to help with after birth pains and to help combat any excess bleeding.
Herbs for soothing my perineum
List of emergency numbers
Ummmm... Think that's it without going to look.

So we now have a vomiting almost 5 yo in the house *sigh*