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I carry an inexpensive light weight over the door hook, I bought at a 99 cent store in my purse. I hang it over rest room doors that don't have one to hang my coat or purse. That way my belongings stay clean and safe while using the restroom.
I realized when finding a second hook that if your door is thinner, you can get more hanger room by flipping them upside down.
The square garners you more hanger space, and the curved part hugs the thinner doors better. You can't see much by the photo, but one hook holds 4 hangers and the other holds 6.
This door is to the hot water heater, but some have cupboards over the washer and dryer, too. Hope that helps.
Sometimes, people leave things in the apartments I live in. These Dollar Tree hooks and an old curtain rod gave me more space in my closet.