Polythene Mailers - Grey 250G
Short description
These grey opaque polythene mailers are a lightweight, durable way to dispatch goods while keeping contents private in transit. Made from strong polythene film and designed with a generous flap for secure sealing, they’re a popular choice for eCommerce fulfilment, mail order, and internal distribution where a clean, professional outer pack is required.
Key features
Opaque grey film for privacy
Grey opaque mailers help conceal the contents of each parcel, supporting discreet delivery and reducing the chance of items being visible during handling. Several suppliers describe this style as fully/100% opaque for confidentiality in transit.
Strong, lightweight polythene construction
Polythene mailers are designed to be tough for their weight, helping protect items from scuffs and handling damage while keeping postage weight low compared with boxes.
Moisture-resistant outer packaging
Polythene provides a water-resistant barrier that helps protect contents from rain splashes and damp conditions during delivery routes and depot handling.
Secure flap closure
This format includes an extended flap (the “+” measurement in the size) to allow reliable sealing. A properly sealed flap helps keep parcels closed through sorting and transport.
Clean presentation for shipping
A smooth grey outer surface gives a neat, consistent look for outgoing parcels and is suitable for applying address labels and shipping documentation.
Efficient packing and storage
Mailers store flat and are quick to pack, making them ideal for busy dispatch benches and high-throughput fulfilment operations.
Key features (at a glance)
- Grey opaque polythene mailer for discreet shipping
- Lightweight packaging to help control postage costs
- Water-resistant outer layer for everyday transit protection
- Flap design for secure sealing
- Flat-packed for easy storage and fast packing
Typical uses
- eCommerce orders: clothing, soft goods, accessories, and non-fragile items
- Mail order and subscription fulfilment
- Returns processing (outbound or in-box return mailer)
- Internal distribution between sites, stores, or departments
- Protective outer wrap for boxed items needing extra moisture resistance
Grey Opaque Poly Mailers — Full Product Guide
Polythene mailing bags are a staple of modern dispatch because they combine speed, protection, and a professional finish. This product is a grey opaque poly mailer made from polythene film and supplied in bulk for efficient packing. The grey colour is widely used for privacy and a consistent brand-neutral appearance.
How it works
Packers place the item(s) inside the mailer, remove excess air, and seal the flap to close the bag. The sealed mailer then acts as the outer shipping pack. For best results, choose a mailer that allows the contents to sit comfortably without over-stretching the film, and ensure the flap is fully sealed along its width.
Because the size includes a flap allowance (shown as “+” in the dimensions), the usable internal space is the main body of the bag, while the flap provides the area needed to close and seal the parcel securely.
Materials and construction
Polythene film
These mailers are made from polythene, a flexible plastic film commonly used for mailing bags due to its strength-to-weight performance and resistance to moisture. The film thickness is specified in microns (often written as “mic” or “mu”).
Opaque grey finish
The grey opaque film is designed to reduce visibility of the contents. Comparable listings for this type of grey mailing bag describe them as opaque (including “100% opaque”), supporting discreet shipping for a wide range of goods.
Flap closure
The extended flap is intended to fold over and seal down. This helps keep the opening closed during handling and reduces the risk of accidental opening in transit.
Parcel protection and performance
Everyday transit protection
Polythene mailers help protect against scuffs, dust, and light moisture exposure. They are particularly effective for soft goods and items that don’t require rigid protection.
Weight efficiency
Compared with cartons, poly mailers add minimal weight, which can be beneficial when shipping large volumes of low-to-medium value items where dimensional weight and postage costs matter.
Discreet delivery
The opaque grey film helps keep the contents out of sight, which can be important for customer privacy and for reducing attention during delivery.
Floor type compatibility
This section is not applicable for mailing bags (they are not a flooring product). If you are using mailers in a warehouse environment, they are compatible with typical packing bench workflows and can be used alongside label printers, packing lists, and standard dispatch processes.
Health and safety
- Keep away from children: Plastic bags can present a suffocation hazard.
- Cutting tools: Use safety knives when opening cartons of mailers and keep blades away from hands and body.
- Manual handling: When moving bulk cartons, follow safe lifting practices.
Ideal applications and use cases
Apparel and textiles
Ideal for clothing, fabric items, and soft accessories where a flexible, moisture-resistant outer pack is preferred.
Non-fragile retail goods
Suitable for items that don’t require rigid edge protection, such as boxed cosmetics, stationery, and small household goods (where additional internal protection can be added if needed).
Multi-item orders
Useful for consolidating multiple small items into one outer pack, helping reduce packaging complexity and speeding up dispatch.
Returns and reverse logistics
Often used as a return mailer when included inside an outbound parcel or supplied to customers for returns processing.
Maintenance, cleaning and care
- Storage: Keep mailers in a clean, dry area away from direct sunlight and heat sources to maintain film performance.
- Handling: Avoid sharp edges on packing benches that could snag or puncture the film.
- Sealing: Ensure the flap area is free from dust or fibres before sealing for best adhesion and security.
Case study (example workflow)
A small-to-medium online retailer dispatching daily orders can streamline packing by keeping a range of grey opaque mailers at the bench. Pickers bring items to the packing station, packers select the closest-fitting mailer, insert the goods, seal the flap, apply the shipping label, and move the parcel to the carrier cage. The opaque grey finish supports discreet delivery, while the lightweight construction helps keep postage costs predictable across high volumes.
Who is it for?
- eCommerce businesses shipping soft goods and non-fragile items
- Warehouses and fulfilment centres needing fast packing materials
- Retailers and mail order operations wanting discreet, professional packaging
- Offices and organisations sending internal or external documents/items that benefit from privacy
Colours / features available
This listing is for grey opaque polythene mailers. Grey is commonly chosen for privacy and a neutral appearance. (Other suppliers offer mailing bags in various colours; availability depends on the range.)
Sizes available
This product page represents a specific mailer format and may be part of a wider range of sizes. The size is typically shown as width x height plus flap allowance (the “+” measurement). If you are choosing between sizes, allow enough room for the contents and any internal protection (such as tissue, inner bags, or padding) without overfilling.
If you need help selecting the best size for your products, consider the packed dimensions of your item (including any inner packaging) and choose a mailer that seals comfortably without stretching.
Reference notes (for buyers)
Comparable supplier listings describe grey opaque polythene mailing bags in this format as 55 micron and in the same dimensional style (width x height + flap). Always confirm the exact specification shown on this page for ordering.