Polythene Mailers - Grey 250G
Grey Opaque Polythene Mailers — Durable, Private & Efficient for High-Volume Dispatch
These grey opaque polythene mailers are designed for fast, reliable packing where presentation, privacy and weather resistance matter. Made from strong polythene film and finished in an opaque grey, they help conceal the contents in transit while keeping parcels lightweight compared with boxes. A peel-and-seal closure flap supports quick packing lines and consistent sealing, making them a practical choice for eCommerce fulfilment, mail order, warehouses and busy despatch departments.
Because this is a configurable product listing, options may vary by pack quantity and size. Please select the variant that matches your required dimensions and pack size.
Key Features
- Opaque grey film for privacy — helps prevent the contents being seen during handling and delivery.
- Lightweight mailing solution — reduces overall parcel weight versus rigid packaging while still providing robust protection.
- Peel-and-seal closure flap — quick to close for efficient packing; supports consistent sealing on busy lines.
- Water-resistant outer layer — polythene helps protect against rain splashes and damp conditions during transit.
- Tear and puncture resistance — suitable for everyday distribution where parcels may be stacked, slid or handled repeatedly.
- Space-saving storage — supplied flat to minimise storage footprint compared with boxes.
- Clean, professional appearance — uniform grey finish for a tidy despatch presentation.
Typical Uses
- Clothing, textiles and soft goods
- Mail order and eCommerce fulfilment
- Warehouse despatch and returns processing
- Non-fragile items that do not require rigid protection
- Secondary outer packaging for boxed items needing extra weather protection
Grey Opaque Polythene Mailers — Full Product Guide
Polythene mailers (also called mailing bags or poly mailers) are a staple packaging format for businesses that ship a high volume of parcels. They are valued for their speed of use, low storage requirements and dependable protection against everyday transit conditions. The grey opaque style is particularly popular where discretion is important, such as fashion, subscription shipments, and general mail order.
How It Works
Mailers are supplied flat. You place the item inside, remove the release liner from the adhesive strip on the flap, then fold and press the flap down to seal. The result is a lightweight, sealed parcel that is easy to label and simple to handle through courier networks.
For best results, ensure the contents sit comfortably within the bag without excessive strain on seams. If you are packing items with sharp corners or edges, consider adding an inner protective layer (such as tissue, bubble wrap, or a small inner carton) to reduce the risk of puncture.
Materials and Construction
These mailers are made from polythene film with an opaque grey finish. Polythene is widely used for mailing bags because it is lightweight, flexible and naturally water-resistant. The opaque pigmentation helps conceal the contents and reduces visibility of internal packaging.
Many grey mailing bags in this category are produced in heavier-duty film for larger formats, supporting improved tear resistance and durability during handling. Thickness is commonly specified in microns (mic), which is a standard way to describe film gauge.
Closure and Sealing
A peel-and-seal adhesive flap is designed to speed up packing and reduce the need for additional tape. Once sealed, the flap helps keep the parcel closed during transit. For returns workflows, some businesses pair mailers with an internal returns bag or include a separate resealable bag for customer convenience.
Weather Resistance and Transit Protection
Polythene mailers provide a practical barrier against rain splashes, damp and general grime encountered in transit. While they are not intended for submersion or prolonged exposure to standing water, they are well suited to typical courier and postal conditions. The flexible film also helps absorb minor knocks and scuffs without crushing the contents, which is ideal for soft goods.
Floor Type Compatibility (Packing Environment)
In a packing environment, mailers work well across a range of setups—from bench packing to conveyor-based fulfilment. Because they are supplied flat and open quickly, they can help reduce packing time and keep workstations tidy. They are also easy to store in racking, drawers or dispensers, supporting efficient pick-and-pack operations.
Health and Safety
As with all plastic packaging, keep mailers away from babies and children due to suffocation risk. In a warehouse setting, store cartons securely and avoid over-stacking. When opening cartons, use safety cutters where possible to reduce the risk of damaging the product or causing injury.
Ideal Applications and Use Cases
eCommerce fulfilment: A fast, consistent packaging choice for daily despatch, especially for apparel and non-fragile items.
Mail order and subscription shipments: Opaque grey helps keep contents discreet and presents a clean, uniform look.
Returns processing: Useful for outbound shipments and can be paired with a separate returns solution depending on your process.
Trade counters and wholesale: A practical option for sending goods to customers or branches without the bulk of boxes.
Maintenance, Cleaning and Care
Mailers are single-use packaging and do not require maintenance. Store them in a clean, dry area away from direct sunlight and heat sources to help preserve adhesive performance and film integrity. If your packing area is dusty, keep open cartons covered between shifts to maintain a clean presentation.
Case Study (Example Workflow)
A small fashion retailer shipping daily orders can keep multiple mailer sizes at the packing bench. Pickers bring items in totes, packers select the closest-fitting mailer, insert the garment (often with a packing slip), seal using the peel-and-seal flap, apply the shipping label, and place parcels into courier sacks. This workflow reduces packing time and storage space compared with using cartons for every order, while the opaque grey film supports customer privacy.
Who is it for?
- Online retailers shipping clothing, accessories and soft goods
- Warehouses and fulfilment centres needing fast packing throughput
- Businesses wanting discreet, opaque outer packaging
- Operations looking to reduce storage space versus boxed packaging
Colours / Features Available
This listing is for grey opaque polythene mailers. Grey is commonly chosen for a neutral, professional appearance and improved discretion. Variants may be available in different pack quantities and sizes within the same product family.
Sizes Available
Mailers are typically offered in multiple sizes to suit different products and packing styles. Select the variant that matches your required internal capacity and flap style. If you are unsure which size to choose, a good rule is to allow enough room for the contents to sit flat without stretching seams, while avoiding excessive empty space that can lead to creasing or snagging in transit.
Tip: If you regularly ship a mix of items, keeping two or three adjacent sizes can improve packing speed and reduce waste.