How to use and introduction of the series products Very easy to use.Simply fold the duvet into the compression bag, close the zipper, remove the valve cap, and vacuum the vacuum and close the cap. Duvet Bags are sold in 3 different sizes. We also sell 4 compression bags for clothes that can be easily compressed by hand.It is also highly recommended for those who have a compression garment that comes in their bag during travel or business trips.