Ken Onion chive very useful for opening boxes. I see a lot of talk about knives for protection but statistically it doesn't happen much. If I really thought I needed protection I'd get a concealed carry permit and walk with a cane.
I carry a tactical folder to open boxes and do other little jobs. That's my story and I'm sticking to it.
I carry a small folder all the time. Not so much for SD, but for the tons of useful things you can do with them.
Whenever I am not at work. Strict rules against it (but I may forget form time to time
Lots of private companies have rules that do not allow you to have
any form of bladed tools.