This high quality water proof bag is sleek and built to perform! Not only is this bag water tight but it is also air tight ensuring the contents of your package stays in the package where it belongs! Equipped with two top handles, this bag is easy and comfortable to carry. The 18'' x 18'' x 16'' large size will fit a Medium box perfectly along with many other package styles. Check one out for yourself and see the All Weather Odor Lock in action!