Heavy on the bottom, light on top, no air in between
Small boxes low, large boxes high, every seam filled so the wall can't shift on I-95.
A box wall like this isn't luck. Smalls and mediums carry the weight at the base, larges ride on top because they hold light bulk, and every gap gets a soft item so the stack can't rock when the truck brakes.
Pack it right and one truckload does what two sloppy loads would — which is the same as saving you an hour of labor.

