For South African exporters and small business owners, this is a frustratingly familiar moment. And more often than not, the answer isn't what's inside the box. It's the box itself.

DHL Express doesn't only charge based on what your parcel weighs on a scale. Every shipment is assessed against its volumetric weight , a figure calculated from the space your package occupies in an aircraft or delivery vehicle , and you're charged based on whichever is higher. A large box stuffed with bubble wrap might weigh next to nothing, but it takes up real estate on a plane. And that space has a price.

Here's what's worth knowing: this is one of the most controllable costs in your entire shipping operation. With a few deliberate packaging habits, you can meaningfully reduce what you're spending per shipment , without compromising on protection. These five strategies will show you exactly how.

1. Right-Size Your Box Every Single Time

It sounds obvious, but using an oversized box is one of the most common , and costly , mistakes exporters make. Grabbing whatever's closest because it's convenient adds unnecessary dimensions to your shipment, and those extra centimetres translate directly into a higher volumetric weight charge. Lekker convenient in the moment, expensive at the end of the month.

The ideal box fits your product snugly. Not so tight that you're risking damage, but close enough that wasted space is kept to a minimum. There's a structural case for getting this right too: under-filled boxes are prone to collapsing under pressure during transit, while overstuffed ones can burst at the seams. A well-fitted box protects both your product and your bottom line at the same time.

2. Eliminate Dead Space Inside the Package

Empty space inside a box doesn't protect your product , but it does inflate your parcel's dimensions and, by extension, its volumetric weight. The goal is to fill all voids properly so your contents can't shift during transit, which is the root cause of most in-transit damage.

A solid rule of thumb: centre your items in the box with at least 6 centimetres of separation from the external walls and corners, then fill that buffer with appropriate cushioning material. As DHL's packaging guide recommends, placing items at the centre of the box and filling surrounding spaces with air pillows or packing material keeps contents secure without adding unnecessary bulk to the outside.

They offer solid protection, keep package dimensions smaller, and directly reduce your dimensional weight charges.

Where boxes are necessary, consider swapping heavier cushioning materials like thick foam or layered bubble wrap for lighter alternatives such as crumpled paper or air pillows. You get equivalent protection with a much smaller physical footprint. For multi-item shipments, wrap each piece individually and use dividers rather than padding out the entire box with excess filler. These consistent, small swaps can add up to a meaningful reduction in your monthly shipping spend , and that's money that stays in your business.

4. Protect Without Overpacking , Then Seal It Properly

Good protection doesn't require excess bulk. For standard parcels, high-quality corrugated cardboard boxes are the go-to choice. For fragile or heavier items, double-wall or tri-wall constructions give you added strength without dramatically increasing the package size. The key is choosing the right grade of box for your specific product, rather than defaulting to oversized packaging to compensate for uncertainty.

Sealing is just as important as packing. Use pressure-sensitive tape , polypropylene or vinyl adhesive tape works well , and apply it using the H-taping method: one strip along the centre seam, and two strips across both edge seams, with all tape secured around the edges. A properly sealed box is far less likely to fail in transit, which means fewer damaged goods, fewer returns, and fewer reshipping costs eating into your margins.

5. Measure Accurately and Understand the Volumetric Weight Formula

To genuinely take control of your shipping costs, you need to understand what's driving them. DHL Express calculates volumetric weight using the formula: length × width × height (in cm) ÷ 5,000, with the result in kilograms. When that figure exceeds your parcel's actual weight, the volumetric weight becomes the basis for your charge.

This makes accurate measurement a non-negotiable habit. Keep precise product dimensions on file for your entire inventory and calculate the volumetric weight before you pack , not after. It's also worth reviewing your shipping data regularly to identify patterns where dimensional charges are consistently high. Those patterns often point directly to packaging inefficiencies that are surprisingly easy to fix once you know where to look. A quick check-in with your DHL account manager to confirm their specific policies is also worthwhile, since charges and thresholds can vary by service type.

DHL South Africa brings together the tools, expertise, and global reach to help exporters and businesses of all sizes ship more efficiently. From transparent volumetric weight calculations to reliable express delivery and hands-on guidance, DHL is well-positioned to help you reduce waste and get more value from every shipment , whether you're sending goods to Nairobi, London, or New York.

If you're looking to simplify cross-border shipping while keeping costs firmly under control, DHL is a logical place to start.

Think of Packaging as a System, Not an Afterthought

Smart packaging isn't something you sort out once everything else is in place. It's one of the most direct levers you have for controlling your shipping costs, and it requires very little investment to get right.

By right-sizing your boxes, eliminating dead space, choosing appropriate materials, and understanding how volumetric weight is calculated, you can meaningfully reduce what you spend per shipment without cutting any corners on protection. The businesses that ship most cost-effectively aren't necessarily the ones spending the most on materials. They're the ones that treat packaging as a system, reviewing it regularly, measuring accurately, and making small adjustments that add up to significant savings over time.

With the right habits in place and a reliable logistics partner behind you, there's no reason your packaging should ever cost you more than it needs to.

Frequently Asked Questions