Good tip on using a jacket in emergencies re. lenses etc.
This was one reason why I bought a large Country Innovations Falcon jacket - it has two large external pockets, and one massive internal zip-up breast pocket. If I had needed to, I could have stuffed 2 large camera bodies and a 300f4 lens (without foot) in this and carried the folded coat under my arm!
As it happened without any emergencies, I used the large internal pocket for the 300f4, without any problems. Other pockets carried Steve's guide, iPod, camera cards, and a couple of camera manuals.