What is a common restriction for non-military carriers?

When considering restrictions for non-military carriers, the type of box used is indeed a common limitation. Many carriers have specific requirements regarding packaging to ensure items are protected during transport and meet safety standards. For instance, certain carriers might mandate the use of specific box designs or materials that are compliant with their shipping regulations and guidelines to prevent damage and facilitate efficient handling.

In contrast to the type of box, restrictions regarding route taken, weight of each individual item, and maximum number of items per shipment can vary more significantly among carriers and often depend upon external factors such as destination, type of cargo, and regulatory compliance rather than being a strict blanket rule applicable to all non-military carriers. These factors can certainly influence shipping, but the type of box is a foundational requirement set by carriers for proper preservation and packing.