Glenn said:
"My original intent was to exclude things you carry for "normal" unexpected events"

Glenn,
I agree with phat, carry good gear that won't fail, at least those items that matter. I cannot concieve of one of my old marmot or TNF goretex jackets ever failing, tearing or needing backup. I call this bomb proof basic gear, things you can bet your life on over and over and KNOW that when you need its service, it will be there.
To answer your original question, batteries and a closed cell pad are the only things that qualify for me unless you consider my compass... Its NEVER used.
Jim