These polypropylene envelopes are sized to hold standard 8.5 x 11-inch documents, and they can hold approximately 50 to 100 sheets. Open them on the long side, store your projects, and snap them closed with the white plastic snap closure and button-flap! Whether your clients use these as reusable portfolios or you order them as business supplies for your own employees, these 0.18 mm envelopes show off your logo for a rock-bottom price per item.