Heavy-Duty Strong Single Wall Cardboard Box 12×9×6″ (304.8×228.6×152.4 mm) – Recycled, Rigid & Reliable Packing Box UK
Heavy-Duty Strong Single Wall Cardboard Box 12×9×6″ (304.8×228.6×152.4 mm) – Recycled, Rigid & Reliable Packing Box UK
This 12×9×6″ heavy-duty single wall cardboard box is a solid choice when you need more space than a small carton, but still want strong protection without the bulk of double wall. Made from an upgraded recycled board, it gives you a rigid, reliable box that feels closer to double wall than standard single wall. It is a favourite size for e-commerce sellers, subscription brands, warehouses and fulfilment teams who need a tough, tidy and eco-friendly packing box that handles daily shipping without drama.
A Stronger Everyday Box for Serious Shipping
Many businesses find standard single wall boxes start to bow, crush or split when loads get heavier or journeys get rough. Double wall can fix the problem, but it adds cost and weight. This 12×9×6″ heavy-duty single wall box is designed to sit in the middle – strong enough for regular courier use, light enough to keep postage costs sensible.
- Upgraded single wall board with near double wall performance
- Rugged enough for heavier e-commerce and warehouse picking
- Neat rectangular footprint for easy stacking and storage
- Lightweight construction to support competitive shipping rates
- Made from recycled material and fully recyclable in the UK
What This Size is Commonly Used For
The 12×9×6″ box is a very flexible size and is often used for:
- Multiple clothing items and accessories
- Larger health and beauty orders and gift sets
- Electronics, peripherals and boxed gadgets
- Candles, diffusers, craft kits and hobby products
- Mixed pick and pack orders from online shops
- Books, catalogues, printed materials and kits
- Subscription boxes and welcome packs
Measurements & Size Guidance
Internal size: 12×9×6″ (304.8×228.6×152.4 mm).
Measurements are internal to help you plan your packing space accurately.
Similar Sizes & Alternatives
If you need a similar strength box in a smaller size:
If you want a cube-style heavy-duty box:
If you want a more budget-conscious standard single wall option around this size:
Heavy-Duty vs Standard Single Wall – Which Should You Choose?
| Feature | Heavy-Duty 12×9×6″ | Standard Single Wall |
|---|---|---|
| Board Strength | Upgraded single wall, near double wall feel | Basic single wall for lighter loads |
| Best For | E-commerce, warehouse picking, higher value items | Simple packing and lower risk shipments |
| Typical Weight | Up to around 6–7 kg when packed correctly | Usually 3–4 kg |
| Cost | Higher protection with strong value at scale | Lower upfront price, less robust |
Box Strength & Weight Capacity
This 12×9×6″ box is made from a heavier B-Flute single wall board, chosen for better compression resistance and edge strength. When packed with suitable padding and sealed correctly, it is commonly used for loads in the region of 6–7 kg, depending on product type and carrier.
How to Pack This Box for Best Results
- Use kraft paper, bubble or paper void fill to protect contents
- Keep heavier items away from the corners where possible
- Fill gaps to reduce movement in transit
- Seal with a quality packing tape – an H-seal across the base and top is recommended for heavier orders
Sustainability & Environmental Benefits
This box is made from 100% recycled cardboard and is fully recyclable, biodegradable and compostable in the UK. It contains no plastic or mixed materials, so it can go straight into normal kerbside cardboard recycling once your customer has finished with it.
Multi-Buy Pricing (inc VAT)
| Pack Size | Total Price | Per Box |
|---|---|---|
| 15 Boxes | £16.99 | £1.13 |
| 30 Boxes | £29.99 | £1.00 |
| 60 Boxes | £54.99 | £0.92 |
| 120 Boxes | £109.99 | £0.92 |
Trade, bulk and pallet quantities available – ideal for regular shippers and fulfilment centres. Contact us for wholesale rates.
Courier & Postal Compatibility
This 12×9×6″ box works well with all major UK couriers including Royal Mail, DPD, Evri, Yodel, UPS and DHL. Always confirm your final packed size and weight with your chosen service, especially for tracked and next day options.
Useful Courier Size Guides
- Royal Mail – Size & Weight Guide
- Evri – Parcel Size Guide
- Yodel – Size Guide
- DHL – Size Guide
- UPS – Dimensions & Weight
- DPD – UK Parcel Guidance
Related Boxes & Collections
- 9×6×6″ Heavy-Duty Single Wall Box
- 10×10×10″ Heavy-Duty Single Wall Box
- 13×11×4″ Standard Single Wall Box
- 14×10×6″ Standard Single Wall Box
- All Cardboard Boxes
- Single Wall Cardboard Boxes
- Small Cardboard Boxes
- Royal Mail Postal Boxes
Why Buy Your Boxes from Us?
We supply packaging to a wide range of UK businesses – from small online sellers and start-up subscription brands to established warehouses and fulfilment centres. Our focus is simple: consistent board quality, sensible sizes, fair pricing and fast, reliable delivery. Boxes like this 12×9×6″ heavy-duty single wall are chosen because they stand up well in daily use and help to cut down on damages and repacking.
Delivery & Despatch
- Same-day despatch before 5 pm (Mon–Fri)
- Royal Mail Tracked for smaller orders
- DPD Next Day available
- DPD Saturday delivery available on request
Need Help Choosing a Size?
If you are unsure whether this 12×9×6″ box is right for your products, our team can talk you through options and neighbouring sizes.
- WhatsApp: +44 7450 981838
- info@mrbags.co.uk
- Click & Collect: 10A Locket Street, Manchester, M8 8EE
- Opening hours: Mon–Fri 10:00–19:00 | Sun 11:00–18:00
| Material | 100% Recycled Corrugated Cardboard |
| Size | 12x9x6 Inch (305x229x152 mm) |
| Color | Brown Kraft |
| Assembly | Supplies flat-packed (Sealed with Packing Tape) |
| Eco-Friendly | Fully Recyclable Biodegradable and Compostable |
| Flute Type | B Flute |
| Recommended Storage | Store in a dry environment at 13–21°C for best performance |
| Strength | Heavy-Duty Single Wall (Near Double Wall Performance) |
| Weight Capacity | Typically up to 6-7 kg when packed correctly |
What items fit well in a 12x9x6 inch cardboard box?
This size works well for clothing orders, beauty gift sets, electronics, books, craft kits, mixed pick and pack orders and subscription boxes.
Is this 12x9x6 box stronger than normal single wall?
Yes. It uses a heavier grade single wall board that performs closer to double wall, giving better protection for heavier or higher value items.
Are the 12x9x6 measurements internal?
Yes, the 12x9x6 inch measurements are internal so you can plan your packing space accurately.
How much weight can this box hold?
When packed correctly with suitable padding, this heavy-duty single wall box is commonly used for loads around 6–7 kg.
Is this box eco-friendly?
Yes. It is made from 100% recycled cardboard and is fully recyclable, biodegradable and compostable in normal UK cardboard recycling.
Does the box arrive flat-packed?
Yes. All boxes are supplied flat-packed to save storage space and can be assembled quickly when needed.
Is this 12x9x6 box suitable for couriers?
Yes. It is suitable for Royal Mail, DPD, Evri, Yodel, UPS and DHL. Always check final parcel weight and service limits.
Do you offer bulk or trade pricing on this size?
Yes. We offer multi-buy pricing on the page and can quote trade and pallet rates for regular users and fulfilment centres.
Can I order a sample 12x9x6 box first?
Yes. Samples can be arranged so you can test the size and strength before placing a larger order.
Royal Mail 24 Tracked
Dispatched same day if ordered before 5 pm Monday to Friday. Please allow up to 1-2 days for delivery.
£1.99
DPD Next Day
Dispatched same day if ordered before 3 pm Monday to Thursday. Not available to Scottish Highlands & Islands.
£4.99
Free on orders over £100