Room To Spare... The "4-in-1-Bag" is definitely one of the more aptly named products we’ve come across in a while. The concept is simple, but effective – four different-sized zippered bags, each of luggage-weight vinyl, that fit inside each other for compact storage until one or more is needed. The bags are available in various colors and, if desired, individually imprintable. Light and flat enough for mailings as well.