Mailing bags MAILmedia K20 White 66 g/m², Size 370×480 mm, protective postal envelopes

MAILmedia K20 White mailing bags are polyethylene postal envelopes with a material weight of 66 g/m² and outer dimensions of 370×480 mm. They are designed to protect documents, textiles and small goods during shipment. The white surface provides a neutral appearance for retail returns and e‑commerce parcels while the lightweight construction reduces postage costs and adds basic water resistance and tear resistance in transit.

Advantages

These protective postal envelopes combine low weight with durable polyethylene construction to offer a cost-effective packaging option. The smooth white exterior is suitable for printing or applying labels and the sealed edges improve resistance to tearing. The size 370×480 mm accommodates folded paperwork, small clothing items and compact goods while minimizing unused volume.

Suitable for

• Mailing documents and letters that need protection from moisture and dirt
• Sending folded textiles, such as T-shirts, scarves or small accessories
• E-commerce shipments of non-fragile items and returns processing
• Lightweight retail shipments where reduced postage cost is important

Key specifications

• Material: polyethylene film
• Material weight: 66 g/m²
• Outer dimensions: 370 × 480 mm
• Color: white
• Protection: water-resistant surface and tear-resistant construction
• Closure: adhesive strip (peel-and-seal) for secure sealing

How to use

Insert the items to be mailed into the envelope, avoiding sharp corners or protrusions that could puncture the polyethylene. Remove the protective liner from the adhesive strip and press the flap firmly to seal. For added security, consider reinforcing the seam with tape if the contents are heavy or if rough handling is expected. Write or attach the shipping label clearly on the outer surface, ensuring any printed addresses are legible.

Usage recommendations

Use these mailing bags for non-fragile items and soft goods; for breakable or high-value products, combine with internal cushioning or choose rigid packaging. Store unopened packs flat in a dry place and avoid prolonged exposure to direct sunlight to maintain material properties.