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PJ4 Poly Mailers measure 255mm x 340mm, making them a versatile size to use in posting many non-fragile items. Made using extra strength 75 micron grey polythene, these mail bags are extremely robust and resistant to water, punctures and tearing. They're also made using 75% recycled content, making them a more environmentally choice than others on the market. These poly mailers are compact to store and easy to pack with a ready to use self-adhesive closure strip that forms a tamper-proof seal to keep goods safe and secure. Due to their lightness, they will be sure to help you keep your postage costs down whilst offering reliable protection for your goods in transit.