First baby - didn't pack a thing...I still had heaps of time right?! Wrong! Went into labour at 36 weeks and ran around the house like a lunatic in the middle of the night throwing whatever I could lay my hands on into a bag. Forgot everything I really needed, and my DH and mother spent the next 3 days bringing it up to me

Second baby - learned my lesson. Bags were all packed at 34 weeks. Baby didn't come until 38 weeks but hey - I was ready

The stuff that you want to keep using - make a list and leave it on top of your bag (you'll need one for things like mobile phone charger, toiletries etc anyway) and just throw those things in when you leave.