Polythene Mailers - Grey 250G
No. 5 Grey Opaque Poly Mailers — Secure, Professional Mailing Bags
These grey opaque polythene mailers are designed for reliable, everyday despatch where privacy, durability and a clean presentation matter. The opaque grey film helps conceal contents in transit, while the generous flap/lip provides a practical sealing area for fast packing. Ideal for fulfilment teams and growing eCommerce operations, these mailers offer a simple, lightweight way to ship non-fragile items efficiently.
Commonly used as a “mail order sack” style mailing bag, this format is widely chosen for clothing, soft goods and boxed items where you want a tough outer layer without the cost and weight of cartons. They are also a popular choice for returns, internal transfers and trade counter collections where a neat, tamper-evident seal is preferred.
Key Features
Opaque grey film (privacy)
The grey opaque material helps prevent the contents being seen during handling and delivery, supporting discreet shipping for retail and trade orders.
70 micron thickness (robust protection)
A 70 micron film is a commonly specified thickness for stronger mailing bags, helping resist tearing and punctures during normal courier networks and warehouse handling.
Large-format mailer with flap/lip
The bag size includes an additional flap/lip area, giving you space to seal securely and apply labels cleanly without crowding the main pack area.
Lightweight packaging to reduce shipping weight
Polythene mailers add minimal weight compared with boxes, helping keep postage costs controlled while still providing a protective outer layer.
Clean, professional presentation
A consistent grey finish gives a tidy, uniform look across shipments—useful for brand presentation and warehouse standardisation.
Efficient packing workflow
Mailers are quick to open, fill and seal, supporting higher throughput at the packing bench—especially when paired with label printers and standard pick/pack processes.
Key Features (Bullet Summary)
- Discreet shipping: opaque grey film helps conceal contents
- Durable: 70 micron polythene for everyday despatch protection
- Practical sealing area: flap/lip provides room to close and label
- Lightweight: helps reduce overall parcel weight vs cartons
- Warehouse-friendly: fast to pack, consistent presentation
Typical Uses
- Clothing and textiles (t-shirts, hoodies, uniforms, soft accessories)
- Soft goods and non-fragile items (fabric samples, promotional items)
- Boxed products needing an outer protective layer
- Returns and exchanges (include paperwork inside for easy processing)
- Internal stock transfers between sites or departments
No. 5 Grey Opaque Poly Mailers — Full Product Guide
Introduction
Grey opaque poly mailers are a staple packaging choice for businesses that ship frequently and want a balance of speed, protection and discretion. This product is a large-format, opaque grey polythene mailing bag with a flap/lip and a 70 micron film thickness. It is commonly supplied in trade pack quantities, making it suitable for regular despatch operations.
How It Works
Poly mailers are designed to act as a protective outer layer around your goods during transit. The typical workflow is straightforward:
- Open the mailer and insert the item(s).
- Remove excess air where practical to keep the parcel compact.
- Seal using the flap/lip area (often with a strong packing tape or an integrated adhesive strip depending on the specific mailer style used in your operation).
- Apply the shipping label to a smooth area for reliable scanning.
Because the film is opaque, the contents are less visible, which can help reduce unwanted attention during delivery and handling.
Materials and Construction
These mailers are made from polythene film in an opaque grey finish. The stated thickness is 70 micron, a specification commonly chosen when you want a sturdier mailing bag that can better withstand the knocks and abrasion of courier networks.
Polythene mailers are valued for being:
- Tear-resistant for everyday handling
- Moisture-resistant compared with paper-based outer packaging
- Lightweight for postage efficiency
As with all flexible packaging, performance depends on how the parcel is packed (sharp corners, heavy items and overfilling can increase the risk of puncture). For items with sharp edges, consider adding an inner layer (e.g., bubble wrap or a protective sleeve) before inserting into the mailer.
Floor Type Compatibility
This section is most relevant to warehouse operations rather than the product itself. Poly mailers are compatible with typical fulfilment environments including packing benches, conveyor-fed despatch lines and manual pick/pack stations. For best results:
- Keep mailers stored flat and dry to prevent creasing and to speed up opening.
- Use a consistent sealing method (tape or adhesive strip) to reduce rework.
- Ensure label application surfaces are clean and smooth for scanner reliability.
Health and Safety
When using polythene mailers in a packing environment, consider the following practical safety points:
- Slip hazards: loose polythene can be slippery—keep off walkways and dispose of offcuts promptly.
- Suffocation risk: keep plastic packaging away from children and follow your site’s packaging safety guidance.
- Cutting tools: if opening returned parcels, use safety knives and cut away from the body.
Always follow your workplace risk assessments and local regulations for packaging handling and waste management.
Ideal Applications and Use Cases
eCommerce fulfilment
A strong choice for online retailers shipping apparel, soft accessories and other non-fragile goods. The opaque grey finish supports discreet delivery and a consistent brand-neutral appearance.
Wholesale and trade despatch
Useful for sending multiple items to trade customers where you want a tough outer layer and quick packing.
Returns processing
Mailers can be used for returns and exchanges, especially when paired with internal paperwork and clear labelling. The robust film helps the parcel survive a second journey.
Protective outer for boxed items
If you ship in small cartons, a poly mailer can act as an outer moisture barrier and help keep labels intact in wet conditions.
Maintenance, Cleaning and Care
Poly mailers are single-use packaging in most despatch workflows. There is no cleaning requirement, but good storage and handling will improve packing speed and reduce waste:
- Store in a clean, dry area away from direct heat sources.
- Keep cartons closed until needed to reduce dust and contamination.
- Rotate stock (first-in, first-out) to keep packaging in best condition.
For disposal, follow your local recycling and waste guidance for polythene film. Many businesses collect soft plastics separately where facilities exist.
Case Study (Typical Workflow Example)
A small-to-medium online clothing retailer standardises on opaque grey poly mailers for most orders. At the packing bench, staff place folded garments into the mailer, remove excess air, seal along the flap/lip area, and apply a shipping label. The 70 micron film helps reduce split bags and re-packs compared with thinner mailers, improving throughput and reducing packaging waste. The opaque grey finish also keeps the contents discreet during doorstep delivery.
Who is it for?
- Online retailers shipping apparel and soft goods
- Fulfilment centres needing fast, repeatable packing processes
- Trade counters and wholesalers despatching mixed orders
- Businesses wanting discreet, opaque packaging for customer privacy
Colours / Features Available
This listing is for grey opaque polythene mailers. Grey is commonly chosen for discretion and a clean, uniform look across shipments. Depending on your broader range requirements, similar mailers are often available in other colours and finishes; select the option that best matches your packing process and presentation needs.
Sizes Available
This product page represents a specific mailer format within a broader range of mailing bags. The size for this listing is shown in the product title and specification line, including an additional flap/lip measurement. If you are choosing between sizes, a practical approach is to measure your typical packed item (including any inner protection) and allow extra room for sealing and label placement.
If you are unsure which size is best for your application, consider ordering a smaller quantity first to test fit, sealing method and label placement in your real packing workflow.
Specification reference (as listed): Grey opaque poly mailer, 70 micron, with flap/lip; previously referenced as 20G05.