180 x 180mm Rigid Cardboard Mailers – 400gsm Brown Peel & Seal

180 x 180mm Rigid Cardboard Mailers – 400gsm Brown

Reliable, Protective Postal Packaging – Box of 100

Keep your products protected during storage, handling and delivery with our 180 x 180mm Rigid Cardboard Mailers. Manufactured from durable 400gsm brown cardboard, these square postal mailers offer a practical packaging solution for books, documents, printed materials and other flat items.

Designed for businesses and individuals who require dependable postal packaging, these cardboard mailers help reduce the risk of bending and damage during transit.

The convenient peel-and-seal adhesive closure allows quick, secure packing without additional tape, while the integrated easy-open tear strip makes opening parcels simple for customers.

Whether you’re fulfilling online orders or sending business documents, these rigid cardboard mailers combine protection, convenience and professional presentation.

Key Features and Benefits

Strong 400gsm Cardboard Construction

Manufactured from durable 400gsm cardboard, these mailers provide a rigid protective layer to help safeguard contents against everyday handling and transit damage.

180 x 180mm Internal Dimensions

The square format is suitable for appropriately sized books, booklets, photographs, printed materials and other flat products.

Quick Peel & Seal Closure

The self-adhesive sealing strip enables efficient packing without requiring additional packaging tape.

Easy-Open Tear Strip

The integrated tear strip allows recipients to open their packages conveniently without excessive cutting or tearing.

Professional Brown Kraft Appearance

The natural brown cardboard finish provides a neat, practical appearance suitable for business and personal deliveries.

Convenient Bulk Packaging

Supplied in boxes of 100, these cardboard mailers are ideal for online retailers, warehouses and fulfilment centres handling regular shipments.