Why FAK exists
Historically, ocean and rail tariffs priced by commodity — different goods, different rates, reflecting value, density, and handling. That is precise but unwieldy for a consolidator whose container holds twenty shippers' different products, or a carrier who doesn't want to rate every SKU. FAK collapses that into one rate for the box: whatever the mix, this is the price. It is the natural rate basis for NVOCC consolidations and for shippers moving diverse product lines under one contract.
FAK is priced per container (FCL) or as a blended basis for the service, and it is what most modern ocean contracts quote for general cargo. It coexists with commodity-specific rates, which survive where a particular good genuinely warrants special pricing — low-value bulk commodities seeking a cheaper rate, or hazardous and specialised cargo that carries surcharges rather than discounts.
When FAK helps and when it doesn't
FAK helps when your cargo is mixed, varied, or shifting — one rate to manage, no per-commodity classification, easy quoting. It can hurt a shipper whose product would qualify for a lower commodity-specific rate: a dense, low-value good might be cheaper on its own commodity rate than on a blended FAK that's averaged up by higher-rated goods in the tariff. The discipline is to know whether a dedicated commodity rate beats FAK for your specific, regular product.
One important caveat: FAK is a freight-pricing convenience, not a customs shortcut. Customs still requires accurate per-item HS classification and valuation regardless of how the freight was rated — 'freight all kinds' never means 'declare all kinds as one thing'. Mixing up the freight rate basis with the customs declaration is a compliance error, not a saving.