Shipping heavy products is a different challenge altogether. A box that happily protects a batch of paper cups will buckle under the weight of syrup bottles, tins or cases of stock. Get the packaging wrong and you risk crushed corners, split seams, damaged goods and unhappy customers, not to mention the cost of replacements and returns. Getting it right, though, is largely a matter of understanding a few practical principles.
Here is how to choose packaging that stands up to weight, handling and the occasional rough journey.
Start with the weight and the fragility
Before you think about boxes, be honest about what you are sending. A dense, solid item like a tub of degreaser powder behaves very differently from something heavy but breakable, such as glass bottles. Both need strength, but fragile heavy items also need cushioning and internal support.
Ask yourself three questions:
- How much does it weigh? This dictates the board strength and the number of walls you need.
- Is it fragile? Liquids, glass and ceramics need extra protection against shock and vibration.
- Can it shift inside the box? Movement in transit is one of the biggest causes of damage.
Understand board strength and wall thickness
Cardboard is not all the same. For heavier goods, the two things that matter most are the number of walls and the board's burst or edge-crush rating.
Single wall
Fine for lighter parcels up to a few kilograms. Suitable for many everyday retail items but not for anything genuinely heavy.
Double wall
The workhorse for heavy products. The extra layer of fluting greatly improves stacking strength and resistance to crushing, making it ideal for cases of bottles, tins and bulk stock.
Triple wall
Reserved for very heavy or industrial loads. Unless you are shipping something exceptionally weighty, double wall usually strikes the right balance between protection and cost.
When in doubt, size up. The small extra cost of a stronger box is almost always cheaper than replacing a damaged order.
Get the size right
A common mistake is choosing a box that is too big and filling the gaps with padding. Excess space lets contents move, adds weight and volume, and can push you into a higher shipping band. A box that closely fits the product is stronger because the contents help support the walls.
Measuring accurately is essential, and it is worth taking the time to do it properly rather than guessing. Our guide on how to measure cardboard boxes for shipping walks through internal versus external dimensions and how to avoid the classic sizing errors that cost money at the till.
Cushion and immobilise the contents
With heavy items, the goal is to stop movement and absorb shock. Choose your void fill and protection based on what you are sending:
- Bubble wrap for wrapping individual glass or fragile items.
- Foam inserts or moulded pulp for bottles that must be kept upright and separated.
- Corrugated dividers to keep multiple items from knocking together.
- Kraft paper or air pillows to fill any remaining voids so nothing slides around.
For liquids in particular, always assume a bottle might leak and pack accordingly. A sealed inner bag can save an entire consignment.
Seal it like you mean it
Weight puts enormous strain on the base and seams of a box. A single strip of tape simply will not hold. Use a strong pressure-sensitive parcel tape and apply the H-taping method: run tape along the centre seam and across both edges, top and bottom. For very heavy loads, reinforce the base further before you even load the box.
Think about the whole journey
Your parcel will be stacked, tipped, dropped and left in vans. Plan for the worst handling, not the best. If boxes will be stacked in storage or transit, stacking strength matters as much as burst strength, which is another reason double-wall board earns its keep.
It also pays to label heavy parcels clearly. A simple ‘heavy’ or ‘this way up’ marking helps couriers handle them sensibly and reduces the chance of damage.
Build consistency into your process
If you regularly ship heavy goods, standardising a small range of well-chosen box sizes and packing materials will save time, reduce errors and keep costs predictable. Matching the right materials to each product line is part of running a tidy operation, and our simple packaging checklist for growing businesses is a helpful starting point for pulling everything together.
Choosing packaging for heavy products really comes down to matching strength to weight, cushioning fragile contents, fitting the box to the item and sealing it thoroughly. Get those four things right and your goods will arrive in the same condition they left, which is exactly what your customers are hoping for.