Is there an ISO standard (for dimensions, weight) for postal packaging materials similar to the standard for shipping containers? The goal is that if the packaging materials meet the standard, then they will pack efficiently in an ISO shipping container.
Something along these lines:
https://www.lowtechmagazine.com/2012/12/how-to-make-everything-ourselves-open-modular-hardware.html
Or a 3-D version of the ISO 216 paper size standard:
https://www.cl.cam.ac.uk/~mgk25/iso-paper.html
Something along these lines:
https://www.lowtechmagazine.com/2012/12/how-to-make-everything-ourselves-open-modular-hardware.html
Or a 3-D version of the ISO 216 paper size standard:
https://www.cl.cam.ac.uk/~mgk25/iso-paper.html