New guardian internal mail envelope c5 85gsm resealable orange pk 500 new guardian internal mail envelope c5 85gsm resealable orange pack of 500 l26311 these new guardian internal mail envelopes are made from durable 85gsm paper and come pre printed with 36 address boxes designed to be re used the c5 envelopes feature a strong resealable intertac tab for security and are suitable for unfolded a5 documents or a4 sheets folded once this pack contains 500 orange envelopes size c5 229 x 1