Even if it's still cardboard, just some carefully thought-out size standards that take into account packing small boxes to fit perfectly into large boxes, and large boxes to stack perfectly onto trucks/forklifts/shipping containers, would have major effects because of the scale at which it would act.
It would also have knock-on effects -- by creating Schelling points for what are generally free variables, your water bottles would be more likely to fit in your car's cupholder, your tupperware would fit in the fridge, and so on.
Oh yeah, and you'd be able to ship your cousin's wineglasses using the boxes that your order of hand soap arrived in, and it would pretty much just fit perfectly.
It would also have knock-on effects -- by creating Schelling points for what are generally free variables, your water bottles would be more likely to fit in your car's cupholder, your tupperware would fit in the fridge, and so on.
Oh yeah, and you'd be able to ship your cousin's wineglasses using the boxes that your order of hand soap arrived in, and it would pretty much just fit perfectly.