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The expandable gusset envelope offers more capacity than flat envelopes, making it ideal for bulky or thicker items like documents, brochures, and catalogues, while maintaining a sleek, compact shape. Available in various gusset sizes and widths. Pack of 125 | 120 GSM Quality. Sealing Type: Peel and Seal | Easy-to-use, secure, and tamper-proof closure with a self-adhesive strip for fast, reliable sealing without moisture or heat. Size: C5 Window (229 x 162 x 25 mm), with a gusset capacity of 25 mm for thick or bulky contents. Suitable for C5 envelopes, where you can fold A4 paper in half. Model No. 6001