What is a long pillow case with two open ends?

A long pillowcase with two open ends is typically referred to as a "body pillowcase." It is designed to fit a body pillow, which is longer than standard pillows and provides support for various sleeping positions. The two open ends allow for easy insertion and removal of the pillow, making it convenient for cleaning and maintenance. Body pillows are often used for comfort, support during sleep, or for therapeutic purposes.