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Our C4 Manilla Board Envelopes are the perfect size for sending A4 documents and items in a professional style. These board backed envelopes offer a combination of strong 1000 micron back board and tough manilla paper front, which protect your documents while also keeping weight and postage costs to a minimum. Our manilla board envelopes are printed with “Please Do Not Bend” to promote careful handling during transit and feature a peel and seal strip for quick and simple packing.