The probability of a package being dropped from a high height is minimal. Most Packages receive many drops at low heights while relatively few receive more than one drop from higher heights. Most packages are dropped on their bases. The heavier the package, the lower the drop height. The larger the package, the lower the drop height.
Handholds reduce the drop height by lowering the container relative to the floor during handling.
Labels such as fragile and handle with care have some effect, but can be considered minor. It is virtually impossible to travel in a vehicle without experiencing some form of vibration. The rotation of engine and wheels induce vibration to the frame. Inconsistencies in the travel medium cause the suspension system to respond and the frame to flex. These inconsistencies may be semi periodic in nature such as expansion joints in a road or rail joints in train tracks, or they may be purely random occurrences such as potholes or railroad crossings.