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Pack of 20 Jumbo Polythene Mailing Bags 50x65cm Secure Peel & Seal Envelopes. These jumbo 50x65cm mailing bags are built for oversized items such as coats, bedding, plush toys, multiple item bundles and large ecommerce orders. Made from heavy duty polythene, they offer excellent strength and flexibility, giving you a dependable packaging option for your biggest shipments. The peel and seal strip creates a strong, tamper resistant closure that secures your items instantly. With waterproof and tear resistant properties, these bags protect your parcels from weather, storage and handling conditions, making them a trusted choice for businesses that need reliable packaging for large or bulky products.