Discontinued Stationary
Grey Opaque Poly Mailers (No.2 / 12x16+2) — Product Overview
These grey opaque poly mailers are designed for fast, reliable despatch of non-fragile items where privacy, weather resistance and efficient packing matter. Made from durable polythene film and finished in an opaque grey, they help conceal contents in transit while providing a lightweight alternative to boxes. The format is commonly used by eCommerce fulfilment teams, mail order operations and warehouses that need a consistent, professional-looking mailing bag that seals quickly and performs well through typical courier and postal networks.
This listing covers a grey opaque poly mailer format identified as No.2 / 12x16+2 and shown on the product page as 300 x 400 + 50mm with a stated thickness of 55 mic. The “+50mm” indicates an additional flap area used for sealing. The product is also referenced as Previously 20G02 on the page.
Key Features
Opaque grey film for discretion
The opaque grey material helps reduce visibility of the contents, supporting customer privacy and a cleaner presentation during delivery.
Lightweight mailing solution
Polythene mailers add minimal weight compared with cartons, helping keep shipping weight down while still providing a protective outer layer.
Moisture and dirt resistance
Polythene provides a barrier against light rain, splashes and general handling grime encountered during transit and last‑mile delivery.
Integrated sealing flap (+50mm)
The additional flap area is intended to fold over and seal the opening, supporting quick packing workflows and consistent closure.
55 micron thickness
The page specifies a 55 mic film thickness, balancing flexibility for packing with durability for typical courier handling.
Common eCommerce-friendly format
The stated size format (No.2 / 12x16+2; 300 x 400 + 50mm) is widely used for clothing, soft goods and other non-fragile items that don’t require rigid protection.
- Opaque grey for discreet deliveries
- Polythene construction for lightweight protection
- Moisture-resistant outer for everyday transit conditions
- Seal flap (additional flap length shown as “+50mm”)
- 55 mic film thickness (as stated on this page)
- Previously coded as 20G02 (legacy reference)
Typical Uses
- Mailing clothing such as t-shirts, hoodies, trousers and other folded garments
- Shipping soft goods (textiles, fabric items, accessories) that don’t need rigid protection
- Despatching bagged items or products already in retail packaging
- General eCommerce fulfilment where speed, consistency and presentation matter
Grey Opaque Poly Mailers — Full Product Guide Introduction
Choosing the right mailing bag is about matching the bag’s size, thickness and closure style to your products and your despatch process. A well-chosen poly mailer can reduce packing time, keep parcels tidy in transit and help protect items from moisture and scuffs. This guide explains how grey opaque poly mailers are typically used, what the key specifications mean, and how to get the best performance from them in day-to-day fulfilment.
How It Works
Poly mailers are simple: place the item inside, remove excess air (without crushing the contents), fold the flap over the opening and seal. The sealed bag forms a lightweight outer layer that helps protect against moisture and surface abrasion. The opaque film also helps conceal the contents, which can be important for customer privacy and to reduce attention during delivery.
For best results, aim for a bag size that allows the product to sit flat without excessive stretching. Overfilling can stress seams and increase the chance of damage during handling.
Materials and Construction
This product is described as a grey opaque poly mailer made from polythene film. Polythene is commonly used for mailing bags because it is lightweight, flexible and resistant to moisture. The page specifies a thickness of 55 mic (55 microns), which is a typical measure used to indicate film gauge. Thicker films generally offer increased puncture resistance and durability, while thinner films can be more economical and easier to compress around soft items.
Because poly mailers are flexible, they are best suited to items that can tolerate some compression. If you are shipping fragile goods, consider adding internal protection (such as bubble wrap) or using a rigid carton.
Understanding the Size Format (No.2 / 12x16+2 and 300 x 400 + 50mm)
The product title includes No.2 12x16+2 and the metric size 300 x 400 + 50mm. In this style of sizing, the first two dimensions refer to the main body of the bag, while the “+” value refers to the flap length used for sealing. The flap is not typically part of the usable internal packing area; it is the section that folds over to close the bag.
When selecting a size, consider:
- Product footprint: the width and height of the item when packed flat
- Bulk: thicker garments or multi-item orders need extra room
- Closure allowance: leave enough space so the flap can fold and seal without strain
Floor Type Compatibility
In a warehouse or packing environment, poly mailers are compatible with most packing station setups. They can be used on benches, packing tables and conveyor-fed packing lines. If you use automated bagging or semi-automated sealing equipment, confirm that the bag format and flap style match your process. For manual packing, keeping mailers in a dispenser or stacked in size order can significantly improve pick-and-pack speed.
Health and Safety
As with all plastic packaging, keep poly mailers away from children and do not allow the bag to be placed over the head due to suffocation risk. In a workplace setting, store mailers neatly to reduce slip/trip hazards from loose packaging. When using cutting tools to open cartons of mailers, use safety knives and cut away from the body.
Ideal Applications and Use Cases
Grey opaque poly mailers are commonly chosen for:
- Fashion fulfilment: garments and apparel orders where presentation and discretion matter
- Accessories and soft goods: items that are not easily crushed and don’t require rigid protection
- Subscription and mail-order: consistent pack format for repeat shipments
- Returns workflows: where a durable outer bag helps protect items on the way back (process dependent)
If your products have sharp corners or protrusions, consider additional internal protection or a thicker/stronger outer packaging option to reduce puncture risk.
Maintenance, Cleaning and Care
Poly mailers are a consumable packaging item and do not require maintenance. To keep them in best condition before use:
- Store in a clean, dry area away from direct sunlight and heat sources
- Keep cartons closed until needed to reduce dust contamination
- Avoid placing heavy items on top of stored mailers to prevent creasing and deformation
Case Study (Typical Packing Workflow)
Scenario: A small eCommerce clothing brand ships daily orders of folded garments.
- Challenge: Reduce packing time while keeping parcels discreet and weather-resistant.
- Approach: The team stages grey opaque poly mailers at each packing bench, pre-prints labels, and uses the flap closure to seal quickly after inserting the order.
- Outcome: Faster packing throughput and a consistent, professional parcel appearance, with improved protection against light rain and handling marks.
This is a representative example of how poly mailers are commonly used in fulfilment environments; exact results depend on products, packing methods and carrier handling.
Who is it for?
- eCommerce retailers shipping non-fragile items
- Warehouses and fulfilment centres needing a fast, consistent packing solution
- Mail order businesses looking for a lightweight alternative to cartons
- Brands that value discreet, opaque packaging for customer privacy
Colours / Features Available
This product page specifies grey opaque poly mailers. If you require other colours, transparency levels, or printed/branded options, these are typically offered as separate products or ranges depending on availability.
Sizes Available
This listing is for the size shown on the page as No.2 / 12x16+2 and 300 x 400 + 50mm. Sapphire product pages may represent a range with multiple variants; select the option that matches your required pack quantity and confirm the size details shown for your chosen variant.
Note: The product page indicates this item as Discontinued Stationary. If you are looking for a current alternative, search for grey opaque poly mailers with similar dimensions and thickness, or contact the supplier for a replacement code (this item is referenced as Previously 20G02).