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100 Strong Polythene Mailing Postal Bags Plastic Material Mailing Or Posting Parecels Bag for Postages Strong Self Seal (28" X 34") STRONG MATERIAL: Heavy-duty grey polythene mailing bags with superior durability for secure packaging and posting of items SELF-SEALING: Features tamper-evident adhesive strip that creates a strong, permanent seal for enhanced security MULTIPLE... 100 Strong Polythene Mailing Postal Bags Plastic Material Mailing Or Posting Parecels Bag for Postages Strong Self Seal (28" X 34")