300G - 400G Polythene Bags
Heavy Clear Poly Bags — Practical Protection for Packing, Storage & Dispatch
These heavy-duty clear polythene bags are designed for everyday packing and protection where a stronger film is preferred. The clear material makes it easy to identify contents at a glance, while the open-top format keeps packing quick and straightforward for busy workplaces. Commonly described as heavy / 400 gauge bags (often referenced as approximately 4 mil or around 100–102 micron in other listings), they’re a popular choice when you want a more robust bag than standard light-duty poly.
Whether you’re organising stock, protecting items from dust and handling marks, or preparing goods for dispatch, these bags offer a simple, cost-effective solution that suits a wide range of industries.
Key Features
Heavy-duty film (approx. 400 gauge / ~100–102 micron / ~4 mil)
A thicker polythene film helps resist tearing and punctures during routine handling, making these bags suitable for heavier or sharper-edged items compared with lighter gauges.
Clear for fast identification
The transparent finish supports efficient picking, packing and stock control—ideal when you need to see what’s inside without opening the bag.
Open-top design for quick packing
Simple open-ended bags are easy to load and can be sealed using tape, labels, staples, heat sealing (where appropriate), or placed inside outer packaging depending on your process.
Versatile protection
Helps protect products from dust, light moisture, scuffs and general contamination during storage and transit (note: not intended as a sterile barrier).
Popular trade sizing
Often sold by the box/pack for convenient workplace use, with sizing commonly referenced in both imperial and metric measurements depending on supplier.
Key Features (Bullet Summary)
- Heavy clear polythene for stronger everyday protection
- Approx. 400 gauge (commonly listed around 100–102 micron / 4 mil)
- Clear finish for easy content visibility
- Open-top for fast loading and flexible sealing methods
- Ideal for packing, storage and dispatch across many sectors
Typical Uses
- Protecting products from dust and handling marks in storage
- Bagging parts, components, fasteners and small assemblies
- Organising stock in warehouses, workshops and retail backrooms
- Packaging textiles, printed materials and boxed items as an inner liner
- General-purpose packing for e-commerce and trade counters
Heavy Clear Poly Bags — Full Product Guide
Introduction
Heavy clear poly bags are a staple packaging consumable: simple, reliable and adaptable. This guide explains what the specifications mean, how to choose the right option, and how to get the best performance in day-to-day packing environments.
How It Works
These bags provide a physical barrier around your product. The polythene film helps reduce exposure to dust and minor moisture, and it prevents surface scuffs caused by rubbing against other items. Because the bags are clear, they also support faster workflows—teams can identify contents quickly during picking, packing, and goods-in checks.
As open-top bags, they’re designed to be loaded quickly. Depending on your packing method, you can leave them open for short-term storage, fold the top over, apply a label, tape the opening, or use a heat sealer where suitable for your operation and the film type.
Materials and Construction
These are made from clear polythene film. In many packaging catalogues, thickness is described using gauge (e.g., 400 gauge) or microns (e.g., around 100–102µ). Some suppliers also use mil (e.g., 4 mil). While exact conversions can vary slightly by convention, these terms are commonly used to indicate a heavier-duty bag compared with standard light-duty options.
The heavier film is chosen to improve durability in real-world handling—particularly where items have corners, edges, or higher weight that could stress a thinner bag.
Understanding Thickness: Gauge, Micron and Mil
Packaging suppliers often describe the same thickness in different ways:
- Gauge: A traditional packaging measure used widely in the UK trade (e.g., 400 gauge).
- Micron (µ): A metric thickness measure (e.g., around 100–102 micron).
- Mil: A common US thickness measure (e.g., 4 mil).
When comparing products across suppliers, focus on the thickness range and the intended duty level (light / medium / heavy). If you’re replacing an existing bag, matching the gauge/micron rating is usually the quickest way to maintain performance.
Choosing the Right Bag for Your Items
To select the best option, consider:
- Item dimensions: Allow room for the product to slide in easily, especially for bulky or irregular shapes.
- Weight and edges: Heavier items or sharp corners benefit from heavier film to reduce tearing.
- Presentation: Clear bags are ideal when visibility matters (retail, kitting, parts identification).
- Sealing method: If you plan to heat seal, ensure your equipment and process are suitable for the film and thickness.
- Outer packaging: For shipping, poly bags are often used as an inner protective layer inside cartons, mailers, or sacks.
Floor Type Compatibility
Not applicable—this is a packaging consumable rather than a flooring product. In a warehouse or packing environment, the key compatibility considerations are with your packing benches, dispensers, heat sealers, and labelling systems.
Health and Safety
As with all plastic bags, safe handling and storage are important:
- Suffocation hazard: Keep plastic bags away from babies and children.
- Workplace safety: Store cartons/boxes securely to prevent trips and falls; avoid leaving loose bags on the floor.
- Heat sealing: If using heat sealers, follow equipment guidance and allow sealing bars to cool before contact.
- Food/medical use: Only use for food contact or clinical applications if the product is explicitly specified/certified for that purpose.
Ideal Applications and Use Cases
These heavy clear poly bags are commonly used in:
- Warehousing & logistics: Parts bagging, stock segregation, pick-face organisation.
- Manufacturing: Protecting components, assemblies, and finished goods from dust and handling marks.
- Retail & e-commerce: Inner protection for garments, accessories, and boxed items; tidy presentation for storage and dispatch.
- Workshops & trade counters: Quick bagging of fittings, fixings, and small hardware.
Maintenance, Cleaning and Care
These are single-use or limited re-use consumables depending on your process. For best results:
- Store in a clean, dry area away from direct sunlight and heat sources.
- Keep cartons closed when not in use to reduce dust contamination.
- Use a consistent packing method (fold/label/seal) to improve presentation and reduce losses.
Case Study (Typical Workflow Example)
Scenario: A small parts distributor needs to keep orders organised and reduce picking errors.
Approach: Items are picked into heavy clear poly bags, a label is applied to the outside, and the bag is placed into an outer carton or mailer. The clear film allows a quick visual check against the pick list before sealing the outer pack.
Result: Faster verification, cleaner presentation, and improved protection against dust and scuffs during handling.
Who Is It For?
- Warehouse and dispatch teams needing a dependable everyday bag
- Manufacturers protecting components and finished goods
- Retailers and e-commerce sellers wanting clear, tidy inner packaging
- Workshops and trade counters bagging parts and fixings
Colours / Features Available
This listing is for clear heavy-duty poly bags. Clear is the most common choice where visibility and quick identification are important. If you require tinted, printed, or resealable options, those are typically separate product lines.
Sizes Available
This product page may represent a configurable range. Choose the size/pack option that best suits your items and workflow. If you’re comparing suppliers, note that sizes may be shown in inches and/or millimetres depending on the catalogue.
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 thickness and size option.