Pack of 30 A4 Cardboard Envelopes, Expandable Capacity Book Mailers, 400gsm, Peel and Seal, Rigid Sturdy, Rip Strip Open, for Royal Mail Letter Posting by Leo Design (30)

A4 Size Medium Duty Cardboard: Measures 234 x 334mm with 350gsm rigid cardboard construction that provides high-impact protection for books, documents, and gifts during Royal Mail Large Letter postage 100% Recycled and Recyclable Material: Made from fully recycled cardboard with no plastic coating, fully compostable and can be disposed of in your household recycling bin Instant Access Rip and Strip Opening: Recipients simply pull the tear strip to open without needing scissors or knives, providing safe, fast, and frustration-free access to contents Puncture-Resistant Construction: Built with corrugated board structure to absorb impact and prevent sharp corners from poking through, ensuring items arrive without holes or creases Versatile Capacity for Multiple Items: Accommodates books, brochures, DVDs, magazines, photos, and any item up to 25mm thick in a single envelope solution Peel and Seal Closure System: Features self-sealing adhesive strip that securely closes the envelope without requiring additional tape or moisture activation PIP Approved for Large Letter Postage: Certified under Royal Mail Packet Integrity Protocol to fit Large Letter size template even when full, helping avoid parcel rate surcharges Pack of 30 Expandable Mailers: Bulk quantity packaging provides sufficient supply for regular shipping needs of small businesses, online sellers, and frequent mailers