Earlier quoted context omitted.
I do that with my keys and wallet whenever I travel because I'm paranoid about losing them.
Traveling is its own house of horrors in this regard because not only is losing something much more disruptive but also your common items tend to be out of place. My keys are never actually in my pockets when I travel, e.g., so my usual pocket patting routine trips me up.
It drives me nuts, because I'm really not that worried about it, I just want to be able to check that I didn't leave it somewhere.