On parcels the choice between a container and an EPS box turns on whether the container comes back. A reusable container's price is divided by the number of trips; if it stays with the recipient there is nothing to divide by, and every shipment carries its full price.

SituationSuitable answer
One way, no returnSingle-use EPS box
Regular shipments to the same customer, return arrangement in placeReusable container
High-value productReusable container, with the loss risk allowed for

As the reusable option, the GEBHARDT Thermobox EPP suits regular customer shipments: 46 litres, 600 x 400 x 320 mm, washable, rated from -30 °C to +80 °C, with an attachment for eutectic plates to extend the time. Before switching, mark ten containers, send them out and count how many return; that rate sets the real cost per trip. Measure the protection time of both boxes with your own product and route.