Before using a duvet, you need to put the duvet cover on it without bunching, stuffing or wrinkling either piece of bedding. The easiest way to do so is to adapt the inside-out method. First, spread the duvet on your bed. Next, open the duvet cover, untying or unbuttoning it completely. Poke your hands inside the cover, grab the far corners and turn the cover inside out. Now, push your arms back into the inside-out cover to grip the corners from the inside. Use your covered hands to also pinch two corners of the duvet. Raise the duvet, shaking the duvet cover down over it as you hold on. Once the entire package is together, close up the duvet cover by its ties, buttons or other means.