Poly String & Button EnvelopeHeavy-duty poly envelopes reisist tears, repel moisture and are available in bright translucent colors for easy organization. Gusset expands up to one and a quarter inches to accommodate bulkier materials. Heavy-duty string and button closure is designed for everyday use. Acid free, PVC free and archival quality. Vertical orientation. Envelope Size: 11 5/8 x 9 3/4; Envelope/Mailer Type: Expanding Pocket; Closure: String and Button.