The inaccuracy of cargo containers, as well as individual skids, gaylords and crates, is a major safety issue that shippers need to be aware of. Generally, freight cost is directly related to weight. It is not unusual for shippers to innocently estimate the weight of a particular shipment below the actual. For example, it is very common for shippers to calculate their shipment size from their product data and neglect to include the weight of the shipping packaging. Usually, a benign issue but multiplied by several shipments per container the bulk shipment could be significantly overweight causing unsafe trucks, ocean vessels and airplanes. The safety issues are significant; reduced braking distance for a truck, buoyancy issues for a sea going vessel and lift problems for an airplane. Most carriers have an entire department to re-weigh freight and confirm their NMFC classification to ensure a transportation vessel is safely loaded.