Today, poor packaging practices result in the average box being 20-40+% bigger than required. Adopting existing technologies and packaging best practices could avoid over a billion tons of emissions over the next decade, and potentially much, much more, while reducing supply chain snarls at sea, in ports, in the skies and roadways by reducing the containers, boats, trucks and planes required to move all the empty space.
Just shrinking 30B parcels, or about 20% of the ~140B shipped in 2020, from 10X10x10 to 9X9X9 would eliminate the equivalent of 2.8M 28-ft Trailers, or enough trailers to stretch from Hong Kong to Los Angeles and back again.