I often ask people I have bought things from over various internet secondhand sources to minimize postage by reducing the packaging.
The worst was a pair of secondhand SPD MTB pedals that came wrapped in 2 layers of bubble wrap and rattling around in a box that could have held 10 pair. They were cheap to start with and the seller didn't get charged for "cubic weight" but volume and weight make a difference.
On the other hand, I can wrap a pair of 700c wheels together in carefully tailored cardboard to barely make it inside Aust Post's guidelines as one item and go interstate for the price of 4kg. Thank goodness that most post office clerks haven't done enough geometry to calculate the volume of a complex parcel correctly!
Shoe boxes are deadly for cubic weight charges. I just bought some bike shoes that are at my suggestion coming wrapped together in half a roll of kitchen cling wrap with a bit of packing tape around the outside to finish it off and hold the label.
It's partly cost, and partly minimizing the environmental impact of the extra jet fuel to fly packaging around. Before I get pinged by someone about buying overseas cheaply and paying transport instead of buying locally and paying more, my approach is that the overall environmental impact is proportional to cost.
Anyway, do many of the rest of you work on packaging to get the best prices both buying and selling?

