Ensure your postcards, small photos, and vital documents reach their destination flat and undamaged with MiltonPack C6/A6 Heavy-Duty Board Backed Envelopes. Engineered for maximum durability, complete privacy, and postal efficiency, these rigid manilla mailers offer professional-grade protection for all your mailing needs.

Key Features & Specifications:

• Royal Mail PIP Letter Compliant: Designed to fit standard Royal Mail 'Letter' size limits (162mm x 114mm), helping you minimize shipping costs for small documents, cards, and photos.

• Rigid Bent-Proof Protection: Constructed with a strong 115gsm paper front backed by heavy-duty card stock to keep contents completely flat and shielded against bending in transit.

• High-Visibility Messaging: Boldly pre-printed with ‘PLEASE DO NOT BEND’ across the front to mandate careful handling by couriers and postal workers.

• Quick Peel & Seal Closure: Features an integrated peel-and-seal adhesive flap for fast, hassle-free packing without the need for additional packaging tape or moisture.

• 100% Opaque Privacy: Heavy brown manilla material conceals contents completely, ensuring total document confidentiality.

Technical Specifications:

• Brand: MiltonPack

• Quantity: Pack of 100

• Style / Size: C6 / A6 (162mm x 114mm / ~6" x 4.5")

• Paper Weight: 115gsm Heavy-Duty

• Color: Brown (Manilla)

• Royal Mail Format: Letter / PIP Compliant

Other sizes available in our store: C5 (229x162mm), C4 (324x229mm), and C3 (457x324mm).