Seven habits that add up
Work through these in order; the first three usually pay back fastest.
Treat the list as a rolling programme. Pick one habit a month, measure its effect on cost per delivered parcel and keep it only if the number improves. Trying all seven at once makes it impossible to tell which one worked.
- Right-size boxes so you do not pay for air or weight bands.
- Compare carrier rates per zone and weight, not overall.
- Cut failed deliveries and returns.
- Consolidate volume to qualify for better rates.
- Set a free-shipping threshold that lifts basket size.
- Use lighter packaging where products allow.
- Audit invoices for weight and fee discrepancies.
How carriers calculate the weight you pay for
Many couriers bill on the higher of actual weight and volumetric weight, which comes from the parcel's dimensions, and then round up to the next weight step. A light but bulky box can therefore cost more than a dense one.
Ask each courier for its volumetric rule and its weight steps, and measure your three most common parcels against them. Often a few centimetres off a box or a slightly different bag moves a parcel into a cheaper band.
Right-size packaging in practice
Packaging is the cost you control most directly. A short audit usually finds easy wins because many stores use whatever box is nearest.
- Measure and weigh your ten best-selling products.
- Choose three to five box or bag sizes that fit them snugly.
- Test protection: ship a few fragile items and check them on arrival.
- Weigh parcels at packing instead of estimating, and record the billed weight against the actual.
- Review the sizes every quarter as your product mix changes.
Cut returns and re-attempt fees
A failed delivery is a shipment you paid for that earned nothing, and it often carries a return fee on top. That makes address quality, order confirmation and clear delivery messages some of the highest-return cost work you can do.
Track the share of parcels that need a second attempt or return and set a target to lower it each month. Even a small drop applies across every shipment you send.
Set a free-shipping threshold with care
Free shipping above a basket value can lift order size, but only if the threshold sits above your average basket by a margin that covers the shipping cost. Set it too low and you simply give away the fee.
Start from your average order value and your margin per order, test a threshold slightly above the average and watch both basket size and profit per order. Adjust in small steps rather than guessing.
Do not optimise away reliability
The cheapest rate loses its appeal if parcels arrive damaged or late. Judge cost per successful delivery, not cost per shipment.
Cost cuts that damage delivery quality are false savings. Lighter packaging that raises breakage, or a cheaper carrier that raises failed deliveries, shifts the cost to refunds, replacements and lost customers, where it is harder to see.
Make cost visible
A report that breaks shipping spend by carrier, zone and outcome shows exactly where to act. You cannot trim what you cannot see.
Build a one-page monthly view: total spend, parcels shipped, cost per delivered parcel, the failed and returned share, and spend by carrier and zone. Review it with whoever takes orders and whoever packs them, because both control the inputs.
Audit carrier invoices every month
Invoices are where small errors hide: a weight billed higher than the parcel, a fee that does not match your rate card, a surcharge that was never agreed. Check a sample every month and all of them when something looks off.
- Match each billed waybill to your own record of weight, zone and service.
- Check every fee against the agreed rate card.
- List differences with waybill numbers and send them to the carrier together.
- Keep the replies, so the same error is not accepted twice.
Negotiate from your own data
Rate conversations go better with numbers. Bring your parcel volume by route, your delivery success rate, your return rate and your growth plan. Carriers value predictable, well-prepared volume and will often respond with better zone rates, lower COD handling fees or clearer return terms.
Ask for what matters most to your cost structure, not for a general discount. A better rate on your top two routes is worth more than a small reduction everywhere.
A quarterly cost review
Shipping costs drift as your products, routes and carriers change. A fixed quarterly review keeps the habits above alive instead of fading after the first burst of effort.
- Compare cost per delivered parcel with last quarter, overall and by route.
- Review the failed and returned share and the main reasons behind it.
- Re-measure your top products and update box sizes if the mix changed.
- Check that each carrier is still the right one for each route.
- Pick the next habit to work on and set a target.