Polythene Mailers - Grey 250G
Grey Opaque Poly Mailers (PWN) — Secure, Lightweight Postal Packaging
These grey opaque polythene mailers are designed for fast, reliable dispatch of non-fragile items. Made from durable polythene film and finished with an opaque grey exterior, they help protect customer privacy by concealing contents during transit. A peel-and-seal closure supports quick packing, while the flexible construction keeps postage weight low compared with rigid cartons—ideal for high-volume fulfilment where speed and consistency matter.
Short description
A strong, opaque grey poly mailing bag with a self-seal flap, suitable for shipping clothing, soft goods and other non-breakable items. The opaque film helps prevent show-through, and the tough polythene resists tearing and moisture during handling.
Key Features
- Opaque grey film for privacy: Grey outer layer helps conceal contents in transit for a more discreet delivery experience.
- 55 micron thickness: A robust film gauge commonly used for mailing bags, balancing puncture resistance with flexibility.
- Peel-and-seal closure: Self-adhesive strip enables fast packing without tape for most standard shipments.
- Water-resistant polythene: Helps protect goods from rain splashes and damp conditions during courier handling.
- Tear and puncture resistance: Polythene construction is designed to withstand sorting, stacking and typical parcel network abrasion.
- Lightweight packaging: Keeps overall parcel weight down versus boxes, supporting cost-efficient postage for suitable items.
- Space-saving storage: Supplied flat to reduce warehouse footprint and improve pick/pack efficiency.
- Professional presentation: Clean grey finish provides a consistent look for ecommerce and mail-order dispatch.
Typical Uses
- Clothing and apparel (t-shirts, hoodies, trousers, dresses)
- Soft accessories (scarves, hats, socks)
- Textiles and home soft furnishings (small linens, cushion covers)
- Non-fragile boxed items that fit comfortably inside the bag
- Returns and exchanges (as an outer protective layer)
- Subscription and mail-order fulfilment where speed is essential
Grey Opaque Poly Mailers — Full Product Guide
Poly mailers are a staple of modern fulfilment because they are quick to pack, lightweight to ship and resilient in parcel networks. This listing covers grey opaque polythene mailing bags with a self-seal flap and a 55 micron film thickness. They are intended for shipping items that do not require rigid protection, while still benefiting from a tough, moisture-resistant outer layer.
How It Works
Place the item inside the mailer, remove the release liner from the adhesive strip, then fold the flap down firmly to seal. The self-adhesive closure is designed to create a secure seal for standard distribution. For higher-risk shipments or where tamper evidence is required, many packers add a secondary seal (for example, a security label or additional tape) depending on internal packing standards.
Materials and Construction
These mailers are made from polythene film and supplied in an opaque grey finish. Polythene is widely used for mailing bags because it is flexible, lightweight and naturally water-resistant. The 55 micron gauge is a common specification for mailing bags, offering a practical balance between durability and ease of handling. The bags are supplied flat for efficient storage and quick access at the packing bench.
Film Thickness (55 micron) — What It Means
Micron (µm) is a measure of film thickness. A 55 micron mailer is typically chosen when you want a sturdier feel than very light-duty mailing bags, while still keeping the package flexible and lightweight. In day-to-day use, this thickness helps the bag resist tearing during handling and reduces the chance of punctures from corners of inner packaging.
Privacy and Presentation
The opaque grey film is designed to reduce visibility of the contents. This is particularly useful for apparel, branded goods and customer returns where discretion is valued. A consistent grey outer also gives a clean, professional appearance across shipments, which can support brand perception even when using a plain outer pack.
Weather Resistance
Polythene mailers provide a water-resistant outer layer that helps protect contents from rain splashes and damp conditions during transit. While no flexible mailer can guarantee protection against full immersion or severe exposure, the material is well suited to typical courier networks and doorstep delivery conditions.
Floor Type Compatibility (Packing Environment)
In warehouses and packing areas, poly mailers are easy to handle on benches, conveyor lines and packing stations. Because they are supplied flat, they can be stored in racking, drawers or wall-mounted dispensers. For best results, keep the adhesive area free from dust and fibres—especially in environments handling textiles or paper products.
Health and Safety
- Adhesive handling: Avoid contact with eyes and do not ingest. Wash hands after prolonged handling if required by your site procedures.
- Slip hazard: Loose polythene can be slippery underfoot—dispose of offcuts and release liners promptly.
- Suffocation warning: Keep plastic bags away from babies and children.
- Manual handling: Use appropriate lifting techniques when moving full cartons of mailers.
Ideal Applications and Use Cases
Ecommerce apparel fulfilment
Poly mailers are widely used for clothing because garments are naturally compressible and do not require rigid protection. The mailer provides a clean outer layer that resists moisture and scuffs.
Mail-order and subscription dispatch
When packing speed matters, peel-and-seal mailers reduce the need for tape and simplify training for new staff.
Returns processing
Many businesses include a mailer for returns or use poly mailers as an outer layer to protect returned goods and keep parcels tidy.
Secondary outer packaging
If an item is already boxed, a poly mailer can act as a protective outer skin to reduce label damage and keep the box clean.
Maintenance, Cleaning and Care
- Storage: Keep cartons in a cool, dry place away from direct sunlight to maintain adhesive performance.
- Adhesive protection: Avoid storing near dust, loose fibres or powders that could contaminate the seal area.
- Stock rotation: Use a first-in, first-out approach so older stock is used before newer deliveries.
Packing Tips (Best Practice)
- Choose the right fit: Select a mailer size that allows the contents to sit flat without excessive stretching at seams.
- Protect sharp corners: If shipping boxed items with sharp edges, consider adding an inner layer (tissue, bubble wrap, or a corner protector) to reduce puncture risk.
- Seal firmly: Apply even pressure along the full width of the flap to ensure a consistent bond.
- Label placement: Apply shipping labels to a clean, dry surface for best adhesion.
- Consider tamper needs: For higher-value goods, add a security label or tape over the flap according to your dispatch policy.
Case Study (Typical Workflow Example)
A small-to-medium apparel retailer dispatching daily orders can streamline packing by storing poly mailers in size-labelled dispensers at each bench. Pickers place folded garments into the mailer, add paperwork if required, then peel-and-seal in seconds. Because the mailers are lightweight and supplied flat, the business reduces storage space compared with cartons and speeds up throughput during peak periods.
Who Is It For?
- Ecommerce brands shipping soft goods and non-fragile items
- Market sellers and mail-order businesses needing fast, consistent packing
- Warehouses looking to reduce packaging weight and storage volume
- Operations that value discreet, opaque outer packaging
Colours / Features Available
This product sits within a range of polythene mailing bags that may be available in different colours and specifications depending on the wider category. The key feature of this variant is the opaque grey finish paired with a self-seal flap and a 55 micron film thickness.
Sizes Available
Poly mailers are commonly offered in multiple sizes within the same product family. Select the size option that best suits your typical order profile. When choosing, allow room for the flap and avoid overfilling so the seal can close cleanly and the parcel remains neat for carrier handling.
Need help choosing?
If you are unsure which mailer size or thickness is best for your products, consider the item dimensions, whether it has sharp corners, and the level of protection required in your carrier network. For fragile items, a rigid box or padded mailer may be more appropriate.