Easy way to keep sheet sets in order and together. after folding I take the fitted sheet, the flat sheet and any pillow cases(if you have 2 or more) and put them all into one of the pillow cases that matches the set. So when you need to change the sheets just grab the pillow case of the set you want and the rest of the contents for that bed are inside! Makes it nice when asking children to grab a set out for their bed. Keeps closets a little less messy looking as well!