Corrugated Cardboard Book Mailer Extendable Envelope Rigid Packaging (10, Brown, M3 (275mm x 352mm))

• Rigid cardboard book mailers help protect books, catalogues, documents, photos and small items from bending, creasing and damage during posting.
• Crease lines allow the mailer to fold and extend, making it suitable for thicker or multiple contents.
• Self-seal adhesive strip allows fast, secure and hassle-free packing without the need for extra tape.
• Built-in tear strip allows the recipient to open the parcel quickly, neatly and conveniently without needing scissors.
• Choose from M1 225 x 289 mm, M2 235 x 320 mm, M3 275 x 352 mm and M4 320 x 382 mm to suit different products.
• Available in pack sizes from 5 up to 2000 mailers, suitable for home use, small businesses and busy dispatch operations.
• Flat-packed mailers are simple to store, quick to fold and convenient for everyday packing and dispatch.
• A practical choice for online shops, marketplace sellers, warehouses and fulfilment centres sending small to medium-sized products
• Perfect for sending books, magazines, brochures, certificates, printed materials, office documents and e-commerce orders.
• Clean and sturdy cardboard packaging gives posted items a neat, reliable and business-ready appearance.

These peel-and-seal extendable cardboard envelope mailers are designed to provide added protection for documents, booklets and small e-commerce orders during posting. The expandable crease lines allow the envelope to fold and extend easily, helping it hold thicker or multiple contents when needed. Each envelope also features an easy-tear opening strip, making it simple for the recipient to open the parcel neatly and with ease. 4 Sizes available: M4 Size: 320 x 382 mm (12.6” x 15”) ; Expanded Size: 250 x 312 x 70mm (9.8” x 12.3” x 2.8”) M3 Size: 275 x 352 mm (10.8” x 13.9”) ; Expanded Size: 205 x 282 x 70mm (8.1” x 11.1” x 2.8”) M2 Size: 235 x 320 mm (9.3” x 12.6”) ; Expanded Size: 165 x 250 x 70mm (6.5” x 9.8” x 2.8”) M1 Size: 225 x 289 mm (8.9” x 11.4”) ; Expanded Size: 155 x 219 x 70mm (6.1” x 8.6” x 2.8”) Sturdy corrugated cardboard construction helps protect items from bending and damage in transit Crease lines allow easy folding and extending to hold more contents Peel-and-seal closure for fast, secure and hassle-free packing Easy-tear opening strip for convenient opening Recyclable material for a more environmental-friendly packaging choice