What is Freight Class?

Freight class is a standard classification system for shipments, defined by the National Motor Freight Traffic Association (NMFTA). It's used to categorize commodities like Glassware for transport, taking into account factors like weight, dimensions, density, storage capability, ease of handling, and liability. Freight class is a system to categorize different types of goods being shipped.

How to determine Freight Class

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Density is a key concept in freight shipping, as it significantly impacts the freight class for commodities like Glassware and hence, the shipping cost. It is calculated as the weight of the shipment divided by its volume. It's the ratio of weight to volume for a given shipment.

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Stowability is used in freight shipping to describe how easily an item can be stowed or stored in relation to other items. For example, when trying to understand stowability for Glassware, it is important to know if the item can be packaged efficiently and stowed onto the truck easily. In other words- It's a measure of how well freight can be accommodated with other freight in a shipment.

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Liability is a term used to refer to the accountability or risk involved in transporting Glassware. It's one of the factors considered when determining freight class. Liability is the accountability of the carrier for the safety and integrity of a shipment.

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Handling refers to the procedures and precautions taken when moving and storing Glassware. It is one of the factors considered when determining freight class for Glassware. It's the procedures involved in moving and storing goods.

Freight Class Commodities


Glassware Glass

Glassware Glassware Jars



Single layer, cut to shape for goggles, sunglasses, helmets or body protective shields, other than optically ground for vision corrective purposes, in boxes.

Common Commodity Items



For many NMFC® codes there isn’t just one single class that is applied. Often, NMFC® numbers have multiple "sub-classes", which are almost always based on the density of the shipment. In the instance where your NMFC® number has multiple sub classes, it's best to contact an expert, like Koho, to help identify which subclass to use.


How do I find my NMFC code?

An organization called the National Motor Freight Traffic Association (NMFTA) publishes a list of freight class designations, codes, and subclasses for many frequently shipped items ( To view this list, you must pay a subscription fee. Learn more about freight classes from the experts at Koho for free on our freight classes pages.

How is the cost of freight determined?

Your freight cost is determined by a number of variables, such as how far your shipment needs to go, the freight class number, whether or not accessorials are needed, as well as fluctuating fuel costs and truck capacity.