Polythene Envelopes 300 x 400 + 50mm lip

These polythene envelopes, sized at 300mm x 400mm with a 50mm sealing lip, are designed for secure and efficient packaging of a wide range of items. Made from 55 micron (220 gauge) grey film, they provide a durable alternative to traditional paper-based mailing solutions.

Tear-Resistant and Weatherproof

The high-grade polythene construction makes these envelopes resistant to punctures, moisture and everyday handling during transit. Ideal for sending clothing, brochures, catalogues and printed material, the opaque grey finish offers content privacy and a clean, professional appearance.

Peel and Seal for Convenience

Each envelope includes a 50mm lip with a reliable self-adhesive strip. Once sealed, the closure ensures the contents stay secure without additional fasteners or tape. This simple design speeds up packing times and keeps parcels intact throughout delivery.

Lightweight and Cost-Effective

These mailing envelopes are lighter than paper alternatives, helping reduce overall postage costs. While lightweight, they retain their structure under pressure and remain suitable for various postal applications, making them an efficient packaging choice for ecommerce, offices, or warehousing needs.

Writable Surface and Labelling

The grey surface allows for clear addressing by pen or marker, and works well with labels or printed adhesive slips. This versatility supports smooth integration into both manual and automated mailing systems.

Product Specifications:

• Size: 300mm x 400mm (+50mm lip)
• Thickness: 55 micron (220 gauge)
• Colour: Grey
• Closure: Peel and seal
• Box Quantity: 500

Used across retail, commercial and industrial sectors, these polythene envelopes are built for secure and lightweight mailing.