Envirotec™ 60 lb. Clasp Envelope Recycled envelope is ideal for document shipping and storage. Heavy cover stock eliminates the need for security tinting. Reusable clasp and reinforced eyelet deliver enhanced durability. Chlorine-free. Natural Brown. Post-consumer recycled content: 40 %. Pre-consumer recycled content: 60 %. Total-consumer recycled content: 100 %.