Columbian CO831 9x12-Inch DuraShield Security Tinted White Envelopes, 100 Count Envelope developed to provide superior protection &amp; security with a professional looking surface. Features advanced multi-layer poly construction which provides ultimate water, chemical, moisture, burst and tear resistant protection. Smooth inner layer allows for quick material insertion and provides complete opacity to assure privacy and confidentiality. Tamper resistant Grip-Seal closure saves time and keeps contents secure. Lightweight white DuraShield material. Open end closure. 9" x 12" 100 envelopes