Lay the doona cover flat with the opening at the top or where it will be easiest to access.
Hold the doona cover opening wide and find the inside corners.
Insert your hands into the cover and grip the corners of the doona.
Push the doona into the cover, corner-first, until the corners match up.
Shake and tug the cover so the doona spreads evenly inside.
Close the cover using the zipper, buttons, or ties.
Smooth and adjust the corners and edges so the doona sits fully in the cover.