I have a small one packed now, but, when i start maternity leave - will pack a proper one.
The one i have now just has the basic essentials in it - pads, knickers, toileties, and 2 pairs pj's. Just in case.
They say you should be packed by 34weeks.
Am also packing extra cloths for my DH - mainly - underwear, shorts, and extra toothbrush, deodrant etc, and something to sleep in.