Polythene Mailers - Grey 250G
No.00 Grey Opaque Poly Mailers — Compact, Professional Postal Bags
These grey opaque poly mailers are designed for sending small items securely and neatly through postal and courier networks. The opaque grey film helps keep contents discreet in transit, while the integrated flap provides a simple closure area for sealing. This listing represents a range of pack quantities for the same style of mailer, making it easy to choose the quantity that suits your dispatch volume.
Key Features
Opaque grey film for privacy
The grey opaque material reduces visibility of the contents, helping to keep shipments discreet during handling and delivery.
Lightweight polythene construction
Poly mailers add minimal weight compared with boxes, helping keep postage costs efficient while still providing a practical outer layer for many non-fragile items.
Integrated flap for sealing
The “+ flap” format includes a dedicated closure flap area, intended to be sealed with an adhesive strip or tape depending on the specific mailer style supplied.
Consistent thickness specification
This product is specified at 55 micron (often referenced as 220 gauge), providing a defined film thickness for repeatable packing performance.
Clean, professional presentation
A plain grey outer surface gives a tidy, uniform look for ecommerce fulfilment, returns departments, and general mailroom use.
- Opaque grey for discreet shipping
- Poly mailer format for lightweight dispatch
- Flap closure area for straightforward sealing
- 55 micron / 220 gauge thickness specification
- Multiple pack quantities available from the same product page
Typical Uses
- Small ecommerce orders such as accessories, soft goods, and non-fragile items
- Mailroom dispatch for documents or lightweight products (where a flexible mailer is appropriate)
- Returns and exchanges packaging for compact items
- Internal distribution between sites where a lightweight outer wrap is preferred
No.00 Grey Opaque Poly Mailers — Full Product Guide
Choosing the right poly mailer is about balancing presentation, privacy, thickness, and the practical realities of packing speed. The No.00 size category is commonly used for compact shipments, and the grey opaque finish is a popular choice for businesses that want a neutral, professional look while keeping contents less visible. Below is a practical guide to help you decide if this mailer format is right for your operation and how to get the best results in day-to-day use.
How It Works
Poly mailers are flexible mailing bags made from polythene film. Items are placed inside the bag, the opening is closed using the flap area, and the parcel is then labelled for shipment. Because the bag is lightweight and conforms to the shape of the contents, it can be an efficient option for many products that do not require rigid protection.
The “+ flap” measurement in the product title indicates that the overall length includes a dedicated flap section used for sealing. In practice, this means you pack into the main body area and then use the flap to close the opening.
Materials and Construction
These mailers are specified as grey opaque polythene with a thickness of 55 micron (also described as 220 gauge in some supplier terminology). Thickness is one of the key indicators of how the film will feel and perform during packing—helping you standardise your packaging across teams and shifts.
Polythene mailers are valued for being lightweight and practical. They are commonly used as an outer packaging layer for items that are not easily damaged by light compression and do not require corner protection.
Understanding the Size Format
The size in the title is shown in a common packaging shorthand: width × length + flap. For example, a format like 120 × 170 + 50 mm indicates the bag’s width, the main body length, and the additional flap length used for sealing. This helps you compare mailers quickly across ranges.
When selecting a size, consider not only the flat dimensions of your product but also any thickness or bulk. Soft items compress and fit more easily; boxed or rigid items may require more clearance.
Floor Type Compatibility
As a packaging consumable, poly mailers are compatible with typical warehouse and packing environments—benches, packing stations, and conveyor-based fulfilment lines. For best results, store cartons of mailers in a clean, dry area and keep them close to the packing point to reduce handling time.
Health and Safety
- Keep packaging away from children and follow internal site safety guidance for plastic film products.
- Use appropriate cutting tools if opening cartons or trimming tape, and follow safe knife practices.
- Maintain clear packing areas to reduce trip hazards from loose packaging materials.
Ideal Applications and Use Cases
Grey opaque poly mailers are commonly chosen for:
- Ecommerce fulfilment where a lightweight, neat outer pack is preferred
- Discreet shipping where reduced visibility of contents is beneficial
- High-throughput packing where simple, repeatable packing steps matter
- Returns processing where a straightforward mailer format supports quick turnaround
If your items are fragile, have sharp corners, or require crush protection, consider pairing a mailer with internal protection (such as cushioning or a rigid insert) or using a box where appropriate.
Maintenance, Cleaning and Care
Poly mailers are single-use packaging items and do not require maintenance. To keep them in best condition before use:
- Store in the original carton until needed to prevent dust build-up.
- Avoid prolonged exposure to direct sunlight or heat sources in storage areas.
- Keep away from liquids and chemicals that could affect the film surface.
Case Study (Typical Workflow Example)
Scenario: A small ecommerce operation dispatches compact, non-fragile items daily and wants a consistent, professional-looking outer pack.
- Pick and check the item at the packing bench.
- Place the item into the mailer, ensuring it sits flat in the body area.
- Seal using the flap area (with the mailer’s closure method or tape as required).
- Apply the shipping label to a clean, flat area of the mailer.
- Sort parcels for carrier collection.
Outcome: The team benefits from a lightweight pack that is quick to use, presents well, and supports discreet shipping.
Who Is It For?
- Online retailers shipping small, non-fragile products
- Warehouse and fulfilment teams looking for a simple, repeatable packing format
- Mailrooms sending compact items where a flexible outer pack is suitable
- Businesses that prefer an opaque mailer for privacy and presentation
Colours / Features Available
This product is listed as grey opaque. The product page may include multiple purchasing options (such as different pack quantities) for the same mailer style.
Sizes Available
This listing is for the No.00 category and uses the standard width × length + flap format shown in the title. As this can be a configurable product page, please refer to the options on the page for the available pack quantities and the exact size notation provided for this mailer style.
Specification summary (as listed): Grey opaque poly mailers, 55 micron thickness (often referenced as 220 gauge), No.00 size format with a sealing flap.