Postal courier envelopes zenwire C4 240 x 325 mm 50 pcs large plastic mailer sleeves

zenwire C4 courier envelopes (240 x 325 mm) are large plastic mailer sleeves designed for shipping documents and other flat items. Each envelope in the pack of 50 accommodates A4-folded paperwork and provides lightweight, waterproof protection with an integrated secure seal suitable for courier services and e-commerce dispatch. The sleeves are made to protect contents from moisture and light handling during transit while keeping packaging effort simple and efficient.

Advantages

The envelopes combine a slim, low-weight profile with water-resistant material to reduce postage costs while maintaining protection. A self-adhesive closure ensures a quick and secure seal without additional tape. The neutral exterior supports clear labeling and barcode application for logistics. The pack size of 50 provides a balance between stock availability and manageable storage for business or home use.

Suitable for

• Shipping folded A4 documents, invoices and contracts
• Sending brochures, thin magazines and catalogs
• E-commerce dispatch of flat goods such as stickers, photos or textiles (thin)
• Postal and courier deliveries requiring moisture protection

Key specifications

• External dimensions: 240 x 325 mm (C4 size)
• Quantity per pack: 50 envelopes
• Material: water-resistant plastic film
• Closure type: self-adhesive strip for secure sealing
• Design: lightweight, slim mailer sleeve

How to use

Insert the folded document or flat item into the envelope so that edges are aligned and the content lies flat. Remove the protective strip from the adhesive closure and press firmly along the seal to secure. For extra protection, add a paper insert with recipient details or an additional label on the exterior. Ensure any barcodes or addresses are clearly visible on the outer surface before handing to a courier.

Usage recommendations

For optimal protection, avoid overfilling the envelope and use additional padding for items with sharp edges. Store unused envelopes in a dry, cool place away from direct sunlight to preserve adhesive performance and material integrity.