I have packed three bags: one for labour (small bag = lollies, powerade, hairband, ipod, DH's shower clothes etc), one for baby and one for me. I think it might be easier to find things if they are in different bags (check with your hospital though as some hospitals have a limit on how many bags you can take).

I went into pre-term labour at 31 weeks (luckily I had my bags packed) and two things which I didnt take and wish I had was my own pillow and a sleeping mask.