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 Qty. | Dimensions: 381 x 254 x 25mm. Gusset Capacity: 25mm | The expandable side seam increases the envelope's capacity, making it ideal for bulky items like documents and brochures. Fits through Royal Mail postbox slots as a Large Letter. Premium Thickness Quality: 140GSM. Model No. 12201
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