It would be easier to think puting it back into the carryon rather than the car.

I usually forget the big bags I have because I say I’ll put it back in the car tomorrow and that ends up being like next week, but the small foldable ones I have always go in and out of my fanny pack immediately, mostly cause if im unloading groceries I still have my fanny pack on and the act of folding it reminds me to put it back