Hi

I started packing things in bags at around 34-35 weeks, but because I was still wearing most of the stuff I wanted to take with me, I ended up just making a list of things that I knew I wanted, so that if I had to get moving in a hurry (which I did), then I could tick things off the list as they were thrown in the bags. Also, having a list meant that DP could help with the last minute packing too, without me getting cranky!
I did this for both hospital & labour bags, although the Baby bag was packed by around 37 weeks. And repacked at 38 & 39 weeks...