A parcel goes one way, so whether a returnable container pays off depends on how often it comes back far more than on its quality: the more trips a container makes, the lower its cost per trip, and one that does not return is a loss.
The calculation uses three items: the container price, the cost of single-use packaging (box, coolant, disposal) and the running cost of a returnable per trip (cleaning, return transport, inspection, tracking). Example figures: container 60, single-use packaging 12, running cost 5 units per trip.
- Break-even trips = 60 / (12 - 5), about 9 trips.
- If the probability that a container returns after each delivery is r, the average number of trips is 1 / (1 - r).
- At r = 0.9 that is 10 trips on average, above break-even; at r = 0.7 it is about 3 trips, and single-use is cheaper.
Single-use is right when the recipient orders once, the address changes every time and the shipment value is low; an insulated card or foam box with gel packs is the answer there. A returnable container works on lanes that serve the same recipient regularly and where the courier can take the empty on the next delivery; subscription boxes are the typical case.
A hybrid, returnable in nearby areas and single-use in distant ones, keeps the return rate high. Containers do not come back if the recipient is not told before shipment that they must keep and return them. In the trial, give each container an ID and record dispatch, delivery, collection and cleaning dates; take r from that record.
