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Pack of 50 Opaque White Envelopes A3 Size 350 x 450 + 40 mm with Closure Flap 60 µ Thick High Strength Plastic mailing bag Especially suitable for sending books, thin A4 boxes small and medium items. A plastic envelope with a permanent and tear-resistant closure that resists all handling Waterproof and tamper-proof: Protects your documents from the elements and ensures extra security. 22g thin envelope: Reduces postage costs while maintaining quality.