Medications and other important identity documents could be placed into a smaller bag that has a clip on the end, so if you have time, you can grab the bag and clip it to your belt or put it around your wrist if long enough.

If everyone does their job, every single aircraft can be evacuated within 90 seconds with half the exits blocked:

https://www.youtube.com/watch?v=XIaovi1JWyY - A380 Emergency Evacuation Test.

Edit: Video from a documentary: https://www.youtube.com/watch?v=_gqWeJGwV_U