300G - 400G Polythene Bags
Overview
These black polythene bags are a heavy-duty, opaque packaging option designed for secure containment and discreet presentation. Manufactured from strong poly film, they’re ideal when you need a tough bag that helps protect contents from dust and light handling while keeping the contents hidden. This product page may cover multiple pack quantities, so please select the option that best suits your usage and storage needs.
Typical uses
- General-purpose packaging and storage for parts, components and supplies
- Warehouse picking, kitting and internal distribution
- Retail back-of-house bagging and stock organisation
- Trade counters and workshops for bundling items
- Light-duty protection during transport (inside cartons, totes or sacks)
Key Features
Opaque black film for discretion
The black colour helps conceal contents for a cleaner presentation and added privacy during handling and storage.
Heavy-duty polythene construction
Made from thick poly film (listed as 89 micron on this product), these bags are suited to more demanding day-to-day use than standard light-gauge bags.
Convenient, versatile format
A simple open-top bag format that’s quick to load and easy to integrate into packing benches, shelving and picking stations.
Helps protect against dust and scuffs
Ideal as an inner protective layer to keep items clean and reduce surface marking during storage and movement.
Multiple pack options
Choose the pack quantity that matches your throughput—use smaller packs for occasional use or larger packs for busy packing areas.
- Opaque black film for discreet packaging
- Heavy-duty thickness (89µ listed) for stronger performance
- Quick to pack open-top bag format
- Protects contents from dust and light handling
- Pack quantity options to suit different usage levels
11x18 Black Poly Bags — Full Product Guide
When you need a straightforward, robust bag for everyday packing and storage, heavy-gauge black polythene bags are a dependable choice. They’re widely used across warehouses, retail stockrooms, workshops and production environments because they’re fast to use, cost-effective, and provide a neat, uniform look.
How It Works
These bags are supplied ready to use. Open the bag, insert the item(s), and close using your preferred method depending on your process—common approaches include folding the top over, applying a label, using tape, or sealing with a suitable heat sealer (where applicable to your workflow and equipment). For best results, avoid overfilling and allow enough headspace for your chosen closure method.
Materials and Construction
This product is a polythene (poly) bag in black film. The listing specifies a heavy-duty thickness of 89 micron, which is typically chosen when you want improved puncture resistance and better durability compared with thinner general-purpose bags. The black pigmentation provides opacity, helping to conceal contents and reduce light exposure.
Strength, Thickness and What “89 Micron” Means
Micron (µ) is a measure of film thickness. A higher micron value generally indicates a thicker, stronger film. At 89µ, these bags sit in a heavy-duty range suitable for frequent handling and for items with corners or edges that might stress a lighter bag. If you’re unsure whether this thickness is right for your product, consider the item’s weight, shape, and whether it has sharp edges—then choose a heavier film for added confidence.
Size Guidance (Imperial and Metric)
The product title includes both imperial and metric sizing. This helps you match the bag to your items whether you measure in inches or millimetres. As with most flexible packaging, the best fit depends on the item’s overall dimensions and how you intend to close the bag. If you’re packing bulky items, allow extra room for thickness and headspace.
Floor Type Compatibility
Not applicable—this is a packaging product rather than a flooring product. However, these bags are commonly used in environments such as warehouses, production floors and retail stockrooms where quick, tidy containment is important.
Health and Safety
- Keep away from children: plastic bags can present a suffocation hazard.
- Manual handling: avoid overloading bags; use appropriate lifting methods for heavier items.
- Sharp items: if packing sharp-edged components, consider additional inner protection or a heavier-duty containment method to reduce puncture risk.
- Workplace housekeeping: store packs neatly to prevent slips/trips and keep packing areas organised.
Ideal Applications and Use Cases
- Warehousing & logistics: kitting, picking, and protecting items inside cartons
- Retail & e-commerce operations: back-of-house organisation and internal transfers
- Workshops & trade counters: bundling parts, fixings and supplies
- Manufacturing: component segregation and WIP (work-in-progress) containment
- Facilities & maintenance: storing consumables and keeping items clean
Maintenance, Cleaning and Care
Polythene bags are typically single-use or limited re-use depending on your application. Store unused packs in a clean, dry area away from direct sunlight and excessive heat. If re-using bags, inspect for punctures, tears or weakened seams before use. Dispose of damaged bags promptly to avoid product loss or contamination.
Case Study (Example Workflow)
Scenario: A busy warehouse needs a consistent way to keep picked items together and reduce scuffing during internal movement.
Approach: Operatives place picked items into black heavy-duty poly bags, apply an ID label to the outside, then place bagged items into totes for transfer.
Result: Faster picking and fewer mixed orders, with improved presentation and reduced surface marking on products.
Who Is It For?
- Warehouses and fulfilment teams needing a tough, quick bagging solution
- Retail stockrooms wanting discreet, uniform packaging
- Workshops and trade counters bundling parts and supplies
- Operations teams looking for a heavy-gauge general-purpose poly bag
Colours / Features Available
This listing is for black poly bags. Black film is commonly chosen for opacity and a clean, consistent appearance. If you require alternative colours or transparency for content visibility, check related product options on the site.
Sizes Available
This product page represents a specific size as shown in the title, and may be offered in different pack quantities via variants. Select the variant that matches your required quantity and stocking preference.
Need help choosing?
If you tell us what you’re packing (dimensions, weight, and whether items have sharp edges), we can help you select the most suitable bag thickness and pack size for your workflow.