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Our C3 White Cardboard Envelopes range includes board backed and all board envelope options which are both designed for sending A3 size documents in a neat and presentable way. These white cardboard envelopes offer a high level of protection during transit for your important documents. Their peel and seal adhesive strip eliminates the need for extra tape and provides a secure closure. These C3 white cardboard envelopes fit the Royal Mails guidelines for medium parcel size.
