Cardboard Maths: Twelve UK DTC Parcels, One Tape Measure and the Cost of Empty Space
Photo: Wil540, CC BY-SA 4.0, via Wikimedia Commons
Parcel opening is usually a five-second thrill: slice the tape, pull out a nest of paper, find the thing you bought. At DirectStore24 we decided to slow that moment down. In autumn 2026 we ordered 12 direct-to-consumer products from UK stores, measured every outer box, noted the filler and estimated the volume of the actual goods. Then we compared the two. The results were not a scandal — they were a maths lesson. A lot of what we pay for in delivery, and sometimes in returns, is empty space.
How we tested
Twelve orders, twelve categories, one tape measure. We used manufacturer dimensions for the products and measured the outer boxes ourselves. For boxed goods we calculated volume; for loose items we used the smallest sensible packed volume. We did not name small independent shops because the point is the pattern, not a pile-on. We did log the order type, the outer box size, the filler and whether the store advertised 'right-sized' or 'plastic-free' packaging.
| Order type | Outer box (cm) | Product volume (approx) | Packaging-to-product ratio |
|---|---|---|---|
| Refillable cleaning starter kit | 48 x 36 x 28 | 4.0 L | 12.1:1 |
| Phone case | 20 x 15 x 10 | 0.3 L | 10.0:1 |
| Grooming subscription | 32 x 24 x 12 | 1.2 L | 7.7:1 |
| Bathroom refill bundle | 40 x 30 x 25 | 5.0 L | 6.0:1 |
| Home fragrance candle | 30 x 25 x 20 | 3.0 L | 5.0:1 |
| Socks | 25 x 18 x 8 | 0.8 L | 4.5:1 |
| Stationery set | 35 x 25 x 12 | 2.5 L | 4.2:1 |
| Supplements | 25 x 20 x 15 | 2.0 L | 3.75:1 |
| Pet treats | 35 x 28 x 18 | 5.0 L | 3.5:1 |
| Skincare set | 30 x 25 x 15 | 3.5 L | 3.2:1 |
| Coffee pods | 40 x 30 x 20 | 8.0 L | 3.0:1 |
| Tea subscription | 30 x 22 x 16 | 4.0 L | 2.6:1 |
The worst offenders
The biggest gap was the refillable cleaning starter kit. The box measured 48 x 36 x 28cm, yet the bottles and dispenser came to roughly 4 litres. It arrived with paper filler and a folded leaflet, and the box could have held three of the kit. That is not a packing failure in the ordinary sense — nothing was damaged — but it is a lot of air to move around the country.
Second was a phone case. The case itself takes up about 0.3 litres, but it came in a 20 x 15 x 10cm box: a padded envelope inside a box, belt and braces, with the box doing most of the breathing. Third was a grooming subscription. The razor handle and two blades sat in a moulded tray, then a cardboard sleeve, then a larger shipping box. A 7.7:1 ratio is not unusual for subscription grooming, but it is avoidable.
None of these stores did anything wrong. Oversized boxes protect goods; couriers throw parcels. But if a retailer is paying for that air, so are you — either in delivery fees, product prices or the threshold for free shipping.
Dimensional weight, decoded
Couriers do not just weigh parcels. They compare actual weight with volumetric weight: length x width x height in centimetres, divided by a carrier divisor. Many UK tariffs use a divisor of 5,000 or 6,000; always check the carrier's terms. A 40 x 30 x 20cm box is 24,000cm3. Divide by 6,000 and the volumetric weight is 4kg. If the contents weigh 1.2kg, the chargeable weight may be 4kg. Divide by 5,000 and it is 4.8kg. Same parcel, more billable kilos, because of the cardboard.
That does not mean every DTC store passes the charge straight to you. But delivery is a cost centre; it has to be recovered. Free delivery thresholds and 'free returns' are priced with this maths in the background.
Why returns make it worse
Returns can magnify the problem. If you send an item back in the original oversized box, some courier tariffs use volumetric weight for the return leg too. A small faulty item can become a 4kg chargeable parcel. Retailers with generous free returns may absorb this, but they also build it into prices. The result is a quiet cross-subsidy: people who buy small, light things pay a little towards the people returning air.
The pre-checkout checklist
Before you click, try these checks:
- Look for packed dimensions on the product page, not just product dimensions.
- Scan review photos for box size. Search reviews for 'huge box' or 'loads of packaging'.
- Check the shipping policy for 'ships in own packaging' versus an outer box.
- Read the returns page: who pays, and does the label use parcel dimensions?
- If buying multiples, ask support whether items are consolidated or sent separately.
- Treat 'plastic-free' as a separate claim from 'right-sized'. Paper filler still takes space.
- Use a delivery locker or click-and-collect if your building cannot take big boxes.
- For repeat subscriptions, ask for a smaller format after the first order.
The verdict
Right-sized packaging is not about minimalism for its own sake. It is about not paying courier rates for cardboard. Our 12 orders did not reveal a villain; they revealed a habit. The stores with the tightest ratios were not the cheapest or the most premium — they were the ones that treated the box as part of the product. In 2026, with delivery costs still doing the heavy lifting, that is a detail worth checking before checkout. If a store can tell you the packed dimensions, it probably knows what it is doing. If it cannot, budget for a little air.
