What does a packaging mark suggesting "do not stack" imply?

The marking of "do not stack" on packaging carries an important safety and handling implication. When a package bears this mark, it indicates that stacking items on top of it could lead to damage of the contents. This could be due to several reasons, such as the structural integrity of the items inside the package or the nature of the materials being handled. Fragile items, for example, are often marked 'do not stack' to prevent weight from above crushing or compromising them.

In contrast, options suggesting items are safe to stack or that only lightweight items can be stacked do not reflect the caution that comes with a "do not stack" mark. The mark itself is indicative of a need for careful handling and specific conditions under which the package should be transported or stored, emphasizing the potential risks associated with improper stacking.