A mod and tank lives in my purse. Not always the same mod and tank - usually whatever doesn't leak, fits in the pocket in my purse, and is charged up enough to last until I get back home.
In the car, the mod is either in the cubby on my door, in an unused cupholder, or in my hand. Never on my lap.
Mods, tanks, and juice don't get left in the car. I learned my lesson about that.
A mod and tank lives on my desk at the office. Purse mod does not migrate into office, and office mod does not migrate into purse, unless there's a problem.
I only keep two kinds of factory-made coils, so have a spare of each kind in my purse. Also carry a charging cable for emergencies.
No mods in pockets.