Large Cardboard Boxes for Shipping: How to Choose the Right Size & Strength

Finding a small cardboard box is usually straightforward. Finding a large cardboard box that actually fits your product can be a different story.

Perhaps you're shipping a large piece of equipment.

A bulky ecommerce product.

An awkwardly shaped component.

Or something that simply doesn't fit into a conventional shipping box.

You might find a stock cardboard box that's big enough.

But is it the right size?

Is the cardboard strong enough?

Will the box flex during handling?

And how much unnecessary empty space are you creating?

When it comes to large cardboard boxes for shipping, choosing the right packaging involves more than finding something your product fits inside.

Here's what you need to consider.

What Is Considered a Large Cardboard Box?

There's no universal definition of a large cardboard box.

One packaging supplier might describe a 500 × 400 × 400mm box as large, while another might reserve that description for boxes exceeding a metre in length.

What matters is the size of the product you're packaging.

A box measuring 600 × 400 × 300mm might be enormous for a small ecommerce product but relatively compact for an industrial component.

At ASC Direct, we manufacture custom cardboard boxes to a wide range of dimensions using our online Box Builder.

That means you aren't necessarily limited to a predetermined stock size.

Rather than asking what size a large box should be, start by asking what size your product actually needs.

Why Are Large Cardboard Boxes Different?

As a cardboard box becomes larger, its structural behaviour changes.

A small box has relatively short cardboard panels.

A large box has longer, wider panels that may be more susceptible to bending, flexing or deformation.

This becomes particularly important when the box is:

• Lifted

• Carried

• Stacked

• Moved through a courier network

• Loaded into a vehicle

• Stored with other boxes

• Supporting an awkwardly shaped product

The weight of the product is important.

But so are its dimensions, shape and the way that weight is distributed.

That's why a large cardboard box requires more consideration than simply selecting the strongest board available.

Does a Large Cardboard Box Need to Be Double Wall?

Not necessarily.

This is one of the most common misconceptions about large packaging.

A large box doesn't automatically need Double Wall cardboard simply because it's large.

However, larger dimensions can increase the need for rigidity.

At ASC Direct, our main cardboard options include:

Single Wall: Approximately 3mm B flute.

Double Wall: Approximately 6mm corrugated board.

Heavy Duty: Approximately 6mm using a stronger board specification.

Single Wall can be suitable for many smaller, lighter products.

Double Wall can provide additional rigidity for larger or more demanding applications.

Heavy Duty may be worth considering where greater board strength is required.

But the correct choice depends on the complete packaging application.

The biggest box doesn't automatically need the strongest cardboard.

Why Weight Isn't Everything

Imagine you're packaging two different products.

Product A

A compact metal component measuring 250 × 200 × 150mm and weighing 10kg.

Product B

A large lightweight component measuring 900 × 400 × 200mm and weighing 5kg.

Product A is twice as heavy.

But Product B needs a much longer box, with larger unsupported cardboard panels.

Depending on how the product is supported and handled, the longer box may be more susceptible to bending.

That doesn't automatically mean Product B needs Heavy Duty cardboard.

It means you can't choose cardboard strength based on weight alone.

You also need to consider:

• Box dimensions

• Product shape

• Weight distribution

• Internal support

• Handling requirements

• Storage conditions

• Box style

A compact heavy product and a long lightweight product can create very different packaging challenges.

Single Wall, Double Wall or Heavy Duty for Large Boxes?

Here's a general guide.

Cardboard grade	When it may be suitable
Single Wall	Larger but lightweight products where the box dimensions and application don't require additional rigidity
Double Wall	Larger, heavier or more demanding products that benefit from greater structural rigidity
Heavy Duty	Applications requiring additional board strength beyond standard Double Wall

These are general descriptions rather than guaranteed performance ratings.

A box's suitability depends on its dimensions, construction, contents and conditions of use.

At ASC Direct, our approximate weight-selection guidelines are 15kg for Single Wall, 20kg for Double Wall and 25kg for Heavy Duty.

However, these aren't guaranteed capacities for every box.

A very large box may require a stronger specification at a lower weight, depending on its construction and use.

If you're unsure, read our guide to Single Wall vs Double Wall cardboard boxes or how to calculate the right box strength for your product.

Large Cardboard Boxes for Lightweight Products

One of the biggest mistakes is assuming that lightweight products don't need much consideration.

Imagine shipping a large plastic component.

It might only weigh a few kilograms.

But if it requires a box measuring 1,000mm in length, the outer packaging still needs to maintain its shape during handling.

The product may also have vulnerable corners or projections.

In this situation, the most appropriate solution could involve:

A more rigid board grade.

A different box style.

Internal cardboard supports.

Protective inserts.

Or a combination of these.

Don't simply make the cardboard thicker without considering how the product sits inside the box.

Large Cardboard Boxes for Heavy Products

Heavy products introduce a different challenge.

The box needs to support the contents, particularly when lifted or moved.

Think about where the weight is concentrated.

A heavy product with a small contact area can place significant pressure on the bottom of a box.

An evenly distributed load may behave differently.

You may need to consider:

Bottom support

Is the bottom closure suitable for the weight?

Weight distribution

Does the product concentrate its weight in one area?

Internal packaging

Could inserts or supports distribute the load more effectively?

Handling

Will the box be lifted manually, moved using equipment or handled by a courier?

Board specification

Does the application justify Double Wall or Heavy Duty?

For particularly heavy or demanding shipments, specialist packaging advice or testing may be appropriate.

Long Cardboard Boxes vs Large Cardboard Boxes

There's an important difference between a box that's generally large and one that's particularly long.

A box measuring:

700 × 600 × 500mm

has a relatively different shape from one measuring:

1,200 × 200 × 150mm

The second box is long and narrow.

That can create different challenges, particularly around bending and flexing.

For long products, the box style and opening orientation may become especially important.

At ASC Direct, we manufacture and supply packaging for products such as:

• Golf clubs

• Guitars

• Sporting equipment

• Long components

• Musical instruments

• Frames

• Industrial products

Depending on the application, a FEFCO 0201 ALT end-opening box or another specialist design may be more suitable than a conventional box.

If your product is particularly long, read our guide to choosing the right cardboard boxes for long items.

What Box Style Is Best for Large Products?

The most familiar cardboard box is the FEFCO 0201.

It has four sides, with top and bottom flaps that meet when closed.

It's a versatile design and works well for many shipping applications.

But it isn't the only option.

FEFCO 0201

A conventional cardboard shipping carton suitable for a wide range of products.

FEFCO 0201 ALT

An alternative orientation that can be particularly useful for certain long or narrow products.

FEFCO 0203

A box with fully overlapping outer flaps, providing additional layers of cardboard across the top and bottom.

Other Specialist Designs

Depending on the product, a wrap-style box or another corrugated design may be more appropriate.

The best style depends on the product's dimensions, shape and protection requirements.

Don't choose a box style simply because it's the one you're familiar with.

How Do You Measure a Large Cardboard Box?

Start by measuring your product's maximum:

Length × Width × Depth

Then consider what additional space is required for protection.

For example, imagine your product measures:

800 × 450 × 300mm

If it requires 20mm of protective material on every side, the minimum internal space needed would be approximately:

840 × 490 × 340mm

This is an illustrative example, not a universal cushioning allowance.

Some products need considerably more protection.

Others may need less.

The important thing is to measure the complete packed arrangement.

ASC Direct's Box Builder uses internal dimensions, so the measurements you enter describe the approximate usable space inside the finished box.

Internal vs External Dimensions on Large Boxes

This becomes particularly important with large cardboard boxes.

Internal dimensions describe the space available inside.

External dimensions describe the overall finished box.

Because cardboard has thickness, external dimensions will be larger.

For example, if you're ordering a Double Wall box with internal dimensions of:

900 × 500 × 400mm

the finished external parcel will be larger than those measurements.

That matters if you're working close to a courier's maximum parcel dimensions.

Don't enter a courier's maximum external dimensions into a box builder that asks for internal dimensions.

You could end up with a finished parcel that exceeds the permitted size.

Always check the actual external dimensions of the completed package against your chosen delivery service's requirements.

Are Large Cardboard Boxes More Expensive?

Generally, larger boxes require more corrugated board to manufacture.

That usually increases the price.

But box pricing isn't calculated purely from the volume of the finished box.

The amount of cardboard needed to manufacture the flat box blank matters too.

Different combinations of length, width and depth can affect how efficiently the box is manufactured.

For example, two boxes with similar internal volumes may require different amounts of board.

This is why changing the dimensions or orientation of a custom box can sometimes affect its price more than expected.

If your product can genuinely be packed in more than one orientation, it's worth comparing the options.

But don't compromise the packaging simply to obtain a lower price.

Why Oversized Stock Boxes Can Be a False Economy

Imagine you need a cardboard box with internal dimensions of approximately:

850 × 450 × 300mm

You find a stock box measuring:

1,000 × 600 × 450mm

The product fits.

Problem solved?

Not necessarily.

You've created a significant amount of additional empty space.

That may mean:

More protective packaging.

More time filling the box.

More storage space.

A larger finished parcel.

And potentially more movement of the product during handling.

The stock box might be cheaper to purchase.

But is it cheaper to use?

That's the question worth asking.

Can a Smaller Box Reduce Shipping Costs?

Potentially.

Some delivery services use dimensional criteria, size bands or volumetric weight calculations when determining charges.

An unnecessarily large box could therefore affect the price you pay to send a parcel.

But this depends on the carrier and service.

Reducing the dimensions won't automatically reduce the shipping price in every situation.

If your current parcel is close to a size or volumetric-weight threshold, it's worth comparing the charges for an appropriately smaller package.

Just remember that the product still needs sufficient protection.

Don't reduce the box size at the expense of safe packaging simply to reach a cheaper delivery band.

How Much Void Fill Should You Use in a Large Box?

Enough to protect and secure the product.

Not enough can allow damaging movement.

But if you're regularly filling a large proportion of the box with paper, air pillows or other cushioning, consider whether the box is unnecessarily oversized.

There's an important distinction between:

Protective packaging your product genuinely needs

and

Packaging used simply to fill a box that's too big.

A fragile product may require substantial cushioning even in a right-sized box.

A robust product may need very little.

The aim is to choose a box around the product and its protection requirements.

Are Large Boxes Suitable for Courier Shipping?

They can be, provided the finished parcel meets the requirements of the delivery service.

Different carriers have different limits covering:

• Maximum dimensions

• Maximum weight

• Combined length and girth

• Oversized parcels

• Handling restrictions

• Packaging requirements

Some large products may require a specialist delivery service rather than a conventional parcel courier.

Before ordering a large custom box, check the current requirements of the carrier you intend to use.

This is particularly important for boxes approaching or exceeding one metre in length.

A box that can be manufactured isn't necessarily one that can be accepted by every parcel delivery service.

Can You Get Cardboard Boxes Over 1 Metre Long?

Yes, cardboard boxes can be manufactured in lengths exceeding one metre, depending on the box design, board specification and manufacturing capabilities.

However, not every size is practical or available in every style.

The maximum dimensions may be limited by:

The available cardboard sheet sizes.

The machinery used to manufacture the box.

The chosen FEFCO style.

The board grade.

And the proportions of the finished box.

If you're looking for a box measuring 1,000mm or more in length, it's worth checking the available configurations in the ASC Direct Box Builder.

For particularly unusual dimensions, our team can advise on suitable alternatives.

Are Large Cardboard Boxes Supplied Flat?

Most conventional corrugated cardboard boxes are supplied flat-packed.

This helps reduce the amount of space required before they're assembled.

But remember that a very large box can still occupy considerable storage space when flat.

If you're storing hundreds of boxes, the dimensions of the flat blanks can become important.

Choosing a box that closely matches your product may help reduce the space required for storing packaging.

Stock Large Cardboard Boxes vs Custom Large Cardboard Boxes

Both have advantages.

When Stock Boxes Make Sense

Stock boxes can be extremely cost-effective because they're manufactured in predetermined sizes and often in larger quantities.

If you can find a suitable stock box that fits your product properly and provides the required strength:

Use it.

There's little benefit in manufacturing a custom box simply for the sake of having a custom size.

When Custom Boxes Make Sense

Custom manufacture becomes particularly useful when:

• The nearest stock box is significantly oversized

• Your product has unusual dimensions

• You need a particular board specification

• You're regularly using excessive void fill

• Your product is long or awkwardly shaped

• You repeatedly ship the same product

• You need a more consistent packing process

Instead of adapting the product or packing process to suit the box, you can manufacture the box around the product.

Can I Order Custom Large Cardboard Boxes?

Yes.

ASC Direct's online Box Builder allows you to create custom-sized corrugated cardboard boxes to your required internal dimensions, subject to the manufacturing limits of the selected style and board.

You can specify:

Length × Width × Depth

Then choose the available:

Box style

Board grade

Colour

Quantity

Printing and additional options

Production service

The Box Builder calculates an instant price based on your specification.

And custom-sized boxes are available from just 25 boxes.

That means you don't necessarily need to order hundreds or thousands of large cardboard boxes simply because you need a particular size.

How Do I Choose the Right Large Cardboard Box?

Before ordering, work through these questions.

1. What are the product's maximum dimensions?

Measure its length, width and depth.

2. What protection does it need?

Allow sufficient room for cushioning, inserts or other protective packaging.

3. How heavy is the product?

Consider the total packed weight.

4. How is the weight distributed?

A concentrated load may require additional support.

5. Is the product unusually long?

An alternative box style or orientation may be more appropriate.

6. How will the box be handled?

Consider lifting, stacking, storage and transport.

7. Does a stock size fit properly?

If it does, compare it first.

8. Would custom dimensions reduce unnecessary space?

If the stock options are significantly oversized, made-to-measure packaging may be worth considering.

Frequently Asked Questions About Large Cardboard Boxes

What is considered a large cardboard box?

There's no universal size definition. Large cardboard boxes are generally those intended for bulkier or unusually sized products, but the exact dimensions vary between suppliers and applications.

Do large cardboard boxes need to be Double Wall?

Not always. The appropriate board grade depends on the product's weight, dimensions, shape and handling requirements. Some large lightweight products may be suitable for Single Wall, while others require Double Wall or Heavy Duty.

Can you buy cardboard boxes over 1 metre long?

Yes. Corrugated cardboard boxes can be manufactured in lengths exceeding one metre, depending on the chosen style, board grade and manufacturing limitations.

What is the strongest cardboard for large boxes?

There isn't one universal answer. Stronger Double Wall or Heavy Duty board specifications may be appropriate for demanding applications, but overall box performance also depends on dimensions, construction, product support and handling conditions.

Are large cardboard boxes expensive?

Larger boxes generally require more cardboard, which can increase the price. The final cost also depends on the board specification, box style, quantity and manufacturing requirements.

Can large cardboard boxes be custom-made?

Yes. ASC Direct's Box Builder allows customers to specify custom internal dimensions and choose from available box styles and board grades.

How much weight can a large cardboard box hold?

There's no universal weight capacity. A box's suitability depends on its dimensions, board grade, construction, weight distribution and conditions of use. Large dimensions can affect strength even when the product isn't particularly heavy.

Can I use large cardboard boxes for shipping?

Yes, provided the box is appropriate for the contents and the finished parcel meets the requirements of the delivery service. Particularly large items may require specialist transport.

What is the minimum order for custom large cardboard boxes?

ASC Direct's Box Builder offers custom-sized cardboard boxes from 25 boxes, subject to the available manufacturing specifications.

Are custom large cardboard boxes better than stock boxes?

Not necessarily. If a suitable stock box fits your product properly, it may be the most economical option. Custom boxes become worth considering when stock dimensions create unnecessary space or don't meet the product's requirements.

Find the Right Large Cardboard Box for Your Product

When you're packaging a large product, it's tempting to focus on finding the biggest or strongest box available.

But that's not necessarily the best approach.

A large box doesn't automatically need to be Heavy Duty.

A heavy product doesn't automatically need the largest box.

And a stock box isn't necessarily the cheapest solution if you're repeatedly filling unnecessary space.

Start with the product.

Measure it.

Consider its weight, shape and protection requirements.

Choose the appropriate box style and board grade.

Then find the dimensions that make sense.

If a stock box fits properly, use it.

If it doesn't, ASC Direct can manufacture a custom-sized cardboard box around your requirements, with orders starting from just 25 boxes through our online Box Builder.

Don't choose a bigger box than you need. Choose the right box for the job.

BUILD YOUR CUSTOM LARGE CARDBOARD BOX →

 

James Palfrey-Smith is the General Manager at ASC Direct with extensive experience in both operations and sales. James is passionate about solving packaging problems, delivering fast customer support, and building lasting relationships. Outside of work, he enjoys outdoor activities like hiking and skiing. A fan of real ale and business podcasts, he continuously seeks personal and professional growth. 

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