These bags are heavy weight but they are archival and uncoated. They make a wonderful enclosure for letter sized documents, notebooks, small books, stacks of letter sized papers, and children's artwork projects. They are heavy enough to hold lots of papers and are sturdy. Other ideas for use: collecting your time capsule items; Book Storage; Classroom storage; Artwork holding and storage; Tool storage; Holding bags for any project that you need proper storage or organization and you cannot do that immediately; seasonal clothing storage. We fold the bags for shipping - if you only order 3, they will be folded!