A4/C4 Manila Board backed envelopes come in boxes of 125 envelopes and are printed with a “Please Do Not Bend” message on the front for maximum security. This envelope is ideal for A4 sized documents, certificates, photos and flat items. A strong paper envelope with a 600gsm rigid backing card ensures excellent protection against folding, bending and damage in transit and these carefully chosen materials also keep weight to a minimum reducing your costs. A wide flexible opening and secure peel and self-seal closure ensures that our board backed envelopes are fast and efficient to pack and flat packing in high quantity boxes helps you store a large volume of envelopes in minimal space.