What a great and easy idea! Just cut a small slit for the hanger and done. No need to run out to the store and spend money on a Garmet Bag. This little trick is handy in a pinch and a great way to Upcycle some of your older (perhaps not your favorite) cases.
Next time you are at the thrift store or see a great sale on some pillowcases. Pick up a few. Unlike the plastic garmet bags, these you can wash and reuse as needed.
*If you click on the picture it will take you to the site where I came across this marvelous idea.