JAM Paper is proud to have the largest selection of poly envelopes in the United States. We manufacture the majority of these plastic envelopes in China ourselves. In each container we import, we are always adding new colors, sizes, and closures. Poly Envelopes are a great way to keep home, school, and office materials organized. They are strong and durable enough to last over time, while compact enough to travel with. You can use them to store special photos, carry important documents, or de-clutter stacks of files. Look for various expansion widths to accommodate increasing papers. Systematizing and color coding has never been easier. If you have a special request, please let us know!