Discontinued Stationary
No. 6 Grey Opaque Polythene Mailers (PWN) — Product Overview
These grey opaque polythene mailers are designed for secure, professional-looking despatch of non-fragile items. The opaque grey film helps conceal contents in transit, while the integrated flap/lip format supports fast sealing for busy packing benches. This listing covers the No. 6 size within the same product family, supplied as a trade-friendly case quantity.
Commonly used across eCommerce, fulfilment, mail order and warehouse operations, grey poly mailers are a practical alternative to boxes for soft goods and other items that don’t require rigid protection. They help reduce overall parcel weight and can streamline packing time compared with carton assembly.
Key Features
Opaque grey film for privacy
The grey opaque material is intended to reduce visibility of the contents, supporting discreet delivery and a consistent, professional presentation.
Mailing-bag format with sealing flap/lip
The “+ lip/flap” style provides an extended closure area to help create a reliable seal and speed up packing workflows.
Trade case quantity
Supplied in a case quantity commonly used by businesses for repeat despatch, helping maintain stock continuity and reduce re-order frequency.
Durable polythene construction
Polythene mailing bags are widely chosen for their tear resistance and ability to protect goods from light moisture and handling marks during transit.
Size No. 6 within a wider range
This product sits within a configurable range of grey mailers, making it easier to standardise packaging across multiple order profiles.
- Product type: Grey opaque polythene mailing bags / poly mailers
- Format: Mailing bag with flap/lip closure
- Typical supply: Case quantity (often 200 per case for this size)
- Common use: eCommerce despatch, mail order, fulfilment and warehouse packing
Typical Uses
- Clothing, textiles and soft goods
- Bagged items and non-fragile products
- Returns and exchanges (when paired with an internal returns label)
- General mail order despatch where a box is not required
No. 6 Grey Opaque Poly Mailers — Full Product Guide
Grey polythene mailers are a staple packaging choice for businesses that ship high volumes of parcels. They are designed to be quick to pack, lightweight to ship, and discreet in appearance. The No. 6 size in this listing is commonly referenced by its imperial and metric dimensions and is part of a broader range of grey mailers used across UK packaging supply.
How It Works
Poly mailers are used as an outer shipping bag. Items are placed inside the bag, the opening is closed using the flap/lip area, and the parcel is labelled for carrier collection. Because the bag is flexible, it conforms to the contents, which can help reduce void space compared with cartons for suitable products.
For best results, choose a mailer size that allows the product to fit comfortably without excessive stretching. Overfilling can increase the risk of seam stress during handling.
Materials and Construction
These are polythene mailing bags made from opaque grey film. Polythene is commonly selected for mailing applications because it is lightweight and offers practical resistance to tearing and scuffing in transit. The opaque grey finish is widely used for privacy and a consistent “trade” look.
Thickness is typically specified in microns for poly mailers. This listing references a 65 micron specification for the No. 6 size, which is a common thickness used for larger grey mailers in UK packaging catalogues.
Closure and Sealing
The “+ lip/flap” dimension indicates an extended closure section. This provides additional area for sealing and helps keep the opening secure. In many packing environments, this format is used with self-seal adhesive (where fitted) or with packing tape, depending on the exact variant and operational preference.
If you require tamper-evident performance, consider pairing the mailer with a security seal label or using a sealing method aligned with your internal despatch procedures.
Floor Type Compatibility (Packing Bench & Warehouse Use)
Poly mailers are well suited to:
- Packing benches and despatch stations
- Pick/pack operations using shelving or racking
- Conveyor-fed fulfilment lines (where flexible packaging is accepted)
Because the bags are lightweight and flexible, they are easy to stage in dispensers or stack in case quantities near the packing area.
Health and Safety
- Suffocation warning: Keep polythene bags away from babies and children.
- Manual handling: Case quantities can be bulky; follow safe lifting practices.
- Workplace safety: Keep loose bags away from walkways to reduce slip/trip risk.
Ideal Applications and Use Cases
Grey opaque mailers are commonly used for shipping:
- Apparel and fashion items
- Soft accessories and textiles
- Non-fragile goods that do not require rigid edge protection
- Multi-item orders where a flexible outer bag is acceptable
They are often chosen when businesses want to reduce packaging weight and speed up packing time, while still presenting a clean, consistent parcel exterior.
Maintenance, Cleaning and Care
Poly mailers are single-use shipping consumables and do not require maintenance. Store cases in a clean, dry area away from direct heat sources and prolonged sunlight to help preserve film performance. Keep stock in original cartons where possible to reduce dust and prevent accidental punctures.
Case Study (Typical Workflow Example)
Scenario: A small-to-medium eCommerce operation shipping clothing and soft goods daily.
Challenge: Reduce packing time and keep parcels discreet while maintaining a professional appearance.
Approach: Standardise on grey opaque poly mailers for soft goods, selecting sizes by order profile and keeping case quantities at each packing bench.
Outcome: Faster pack-out compared with assembling cartons for suitable orders, consistent parcel presentation, and reduced overall shipping weight for mailer-appropriate items.
Who Is It For?
- Online retailers and marketplace sellers
- Fulfilment and 3PL operations
- Warehouses shipping non-fragile goods
- Mail order businesses seeking discreet packaging
Colours / Features Available
This product sits within the grey mailer category. Grey is commonly selected for opacity and a neutral, trade-ready appearance. Depending on the wider range, businesses may also stock alternative colours or printed options for branding; however, this listing is specifically for grey opaque mailers.
Sizes Available
Sapphire product pages in this category often represent a range of sizes within the same family. This listing is the No. 6 size, commonly referenced as 21" x 24" with a 2" flap (also shown in metric as 525 x 600 with a 50mm lip). If you ship multiple product types, consider standardising across several sizes from the same range to match different order profiles.
Need help choosing a size?
Select a mailer that allows your product to fit without excessive stretching, leaving enough room for the closure area and label placement.
Reference notes (for buyers): This product is also referenced by other UK packaging suppliers using the same size format (525 x 600 x 50mm / 21" x 24" x 2").