This cubby holder is multi functional. It can attach to the 1 Inch back rail of your bunk end or to the E Style clip on your top bunk end and side walls. We supply a modular clip that lets you attach the cubby where ever you want. Cell Phones...Wallets...Keys... store what ever you want at a moments reach from your bunk end if you need it quick. Works on the either the left or right side. It will also clip into the 1 Inch section of your Shepherds Pole for overhead storage!!! 3D printed in durable PETG plastic.