Ideal for mailing bulky items such as catalogues, reports, brochures and more, these Plus Fabric envelopes feature an expanding 25mm gusset and durable, heavyweight 120gsm bright white paper. The envelopes also feature a convenient address window measuring 45 x 100mm and simple peel and seal closure with Power-Tac adhesion for a quick, strong seal. Suitable for A4 documents, this pack contains 100 C4 envelopes.