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.
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I love the over the door hooks you get at the dollar stores. But sometimes, they can be used in the laundry room for catching the clothes before they wrinkle.
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.