Freight is classified using the item's density, as determined by its weight and dimension. Stowability, handling and liability are also considered when identifying freight classification.
The density of freight is determined by examining the pounds per cubic foot of the item. Higher density items are considered lower class freight.
Freight's stowability is rated by considering the difficulty it presents while shipping, particularly when shipped alongside other items. Objects with unconventional dimensions that prohibit any other freight on board, as well as hazardous items that cannot be transported with anything else, rate poorly when stowability is considered, therefore making these items higher class freight.
Handling is determined in a similar manner. The fragility of the freight is considered, as well as the packaging in which it is shipped, as packages that take more skill to load and unload are considered higher class freight.
Liability estimates the probability of damage of the freight or damage to other pieces of freight because of it. It also takes into account the likelihood of the item being stolen.
Pricing for freight shipment is determined by the item's class. Lower class freight receives lower shipping prices, while higher class, freight - typically riskier to ship - is priced at a higher rate.