Extensively.

My son recently went on a camping trip with his school off in the woods in central PA. I vac-sealed some first aid supplies, fire-starting equipment, dry socks and some batteries. Two reasons.

In my jeep I keep some tools I don't use frequently and stuff that I don't mind re-packing when I need them (like a poncho). Even though I'm not a fire/rescue guy anymore, I still keep the same emergency kit in my truck that I used when I was active.