Polythene Mailers - Grey 250G
No.1 Grey Opaque Poly Mailers are a practical, lightweight way to dispatch non-fragile items securely while keeping contents private in transit. Made from opaque grey polythene, these mailing bags are designed for everyday eCommerce fulfilment where you want a clean, professional outer pack that helps protect goods from moisture and handling marks.
These mailers are commonly chosen for clothing, soft goods and boxed items that don’t require rigid protection. The opaque film helps conceal the contents, while the self-seal flap format (the “+ flap” shown in the size) supports fast packing at the bench.
Key Features
- Opaque grey film for privacy – helps prevent the contents being seen during delivery and returns handling.
- Lightweight outer packaging – keeps postage weight down compared with cartons while still providing a protective wrap.
- Everyday thickness (55 micron) – a popular specification for general mailing applications where a balance of strength and cost is required.
- Self-seal flap format – the additional flap length (often shown as “+ 2” / +50mm) is intended to speed up packing and provide a secure closure.
- Clean, professional presentation – a neat grey finish that suits most brands and shipping workflows.
Typical Uses
- Clothing and textiles (t-shirts, hoodies, trousers, scarves)
- Soft accessories (caps, bags, fabric items)
- Printed materials and catalogues (where rigid protection isn’t required)
- Returns packaging for fashion and general merchandise
- General eCommerce dispatch for non-fragile goods
No.1 Grey Opaque Poly Mailers — Full Product Guide
Choosing the right mailing bag is about matching the film specification and format to your packing speed, product type and carrier handling. Grey opaque poly mailers are widely used across eCommerce because they are quick to pack, present well, and provide a dependable barrier against light moisture and scuffs during transit.
How It Works
Poly mailers are designed as an outer shipping pack. You place the item inside, remove the release liner (where applicable) and fold the flap down to seal. The flap allowance shown in the size (for example “+ 2” or “+50mm”) refers to the extra length used for the closure area, helping you achieve a secure seal without reducing the usable internal space for the product.
Materials and Construction
These mailers are made from polythene film and supplied in an opaque grey finish. The listed thickness is 55 micron, a common specification for general-purpose mailing bags. Opaque film is chosen specifically to reduce visibility of the contents, which can help with customer privacy and reduce the temptation for interference in transit.
Floor Type Compatibility (Packing Bench & Warehouse)
Poly mailers suit most fulfilment environments, from small packing benches to higher-throughput warehouse lines. They store flat, take up minimal space, and can be pulled quickly from a stack. For best results, keep the sealing area free from dust and fibres (especially in garment packing areas) so the closure can bond cleanly.
Health and Safety
As with all plastic packaging, keep mailers away from babies and young children due to suffocation risk. In a warehouse setting, store cartons of mailers in a dry area and avoid placing heavy loads on top of open packs to prevent creasing or deformation that can slow down packing.
Ideal Applications and Use Cases
Fashion fulfilment: A staple for clothing and soft goods where the product can tolerate gentle flexing. Many shippers place garments in an inner bag or tissue wrap first, then use the poly mailer as the outer shipping layer.
General merchandise: Suitable for items that are not fragile and do not require crush protection. If you are shipping boxed goods, ensure the box edges are not sharp enough to stress the film during handling.
Returns: Opaque grey mailers are often used for returns workflows because they are simple for customers to reseal with tape if needed and provide a tidy appearance.
Maintenance, Cleaning and Care
Poly mailers require no maintenance, but good storage helps preserve usability:
- Store in a cool, dry place away from direct sunlight.
- Keep packs sealed until use to reduce dust contamination on the sealing area.
- Avoid compressing open stacks, which can cause curling and slow down packing.
Case Study (Typical Workflow Example)
A small-to-medium online apparel retailer typically uses grey opaque poly mailers as the final outer pack. Items are folded, optionally placed into an inner clear bag for presentation, then inserted into the mailer. The self-seal flap speeds up dispatch during peak periods, while the opaque grey film keeps the parcel discreet for doorstep delivery. This approach reduces carton usage and storage space while maintaining a professional shipping appearance.
Who is it for?
- eCommerce sellers shipping clothing, textiles and other non-fragile items
- Fulfilment operations looking to reduce packaging volume and packing time
- Brands that prefer discreet, opaque outer packaging
- Businesses that want a straightforward, cost-effective mailing solution
Colours / Features Available
This listing is for grey opaque poly mailers. Opaque grey is commonly selected for privacy and a neutral, professional look. (Other colours and specifications may be available elsewhere in the range.)
Sizes Available
This product page represents a size option within the grey opaque poly mailer range. The size is shown in both imperial and metric on the listing, and includes an additional flap allowance (often shown as “+ 2” / +50mm) for sealing. If you are choosing between sizes, allow room for the product thickness and any inner packaging (such as an inner bag or tissue wrap) so the flap can close comfortably without strain.
Need help choosing the right mailer?
If you’re unsure which size or thickness is best for your products, consider the packed dimensions (including any inner wrap) and how the parcel will be handled by your carrier. For higher-value items, you may also wish to use an inner bag or add a document enclosed wallet for paperwork on the outside of the parcel.