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Protect what's inside with these specially designed envelopes with open side closure. Superior protection and resistance against water, chemicals, moisture, bursting, tearing and puncturing. Ideal for mailing bulky items and materials. Excellent alternative to boxes and cartons. Offers a convenient, secure and no moisture required Grip-Seal flap. Simply peel off release strip and press down for a quick, secure seal. Made of heavy-duty 18 lb. Tyvek material.
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