Having a great bag is so important to your success. You need proper storage for all your essentials. I tend to pack the bag the night before and double check before I leave. I got a pretty good list into the video, but here is exactly what I take in the bag:
sunglasses (one dark, one amber in case it's late or the single track is dark)
Hand Up gloves (two pairs if its a muddy or wet day)
base layer top
jersey and bibs
skin suit (I have two, one to race in and the older one always stays in the bag as an emergency precaution).