Plastic envelopes that looks and feels like paper saves on postage costs weatherproof burstproof tear and puncture resistant easy to write on surface accepts handwriting stamps or franking white opaque envelopes made from 100 polythene secure peel and seal closure size w460xh430mm packed 20 pack dimensions 210x500x20 mm features size w460xh430mm p28s and 20 pack plastic envelopes that looks and feels like paper saves on postage costs weatherproof burstproof tear and puncture resista