This is a simple hook I designed a while back for hanging my kids masks from the headrest in my car at the height of COVID because I was tired of them being left in the car and falling on the floor only to get stepped on and ruined. Since then, they have proved useful for hanging all kinds of things from grocery bags, or trash bags, to purses - my son even used 2 together to hang his iPad up for a long road trip, it worked pretty okay. 

I have printed several, and even sold some around my area, PETG probably is better for in the car than PLA especially if you live somewhere that gets pretty warm.