Cube Out is a logistics term used when a trailer, container, or vehicle is filled to its available volume before it reaches its maximum weight capacity. The load takes up all the cubic space, so no more freight can be added, even though the vehicle could technically carry more weight. This usually happens with bulky but relatively light items, and it affects freight cost, vehicle choice, and how routes are planned.
What is Cube Out?
In transport and warehousing, Cube Out refers to the point where space, rather than weight, becomes the constraint on how much you can move or store. A truck, van, or container is considered “cubed out” when it is physically full by volume even though it has not reached its legal or rated weight limit.
This situation is common with lightweight but bulky products, where boxes are large compared to their weight. Loads like this occupy a lot of space, so operators quickly hit the volumetric limit of a vehicle.
Cube Out is closely related to dimensional weight, where carriers charge based on the space a package takes up rather than its actual weight when that space use is high. For shippers, understanding when loads are likely to Cube Out helps with choosing vehicle sizes, designing packaging, and calculating realistic cost per delivery.
How Cube Out impacts your business
If your deliveries often Cube Out, you are paying for unused weight capacity, which can raise freight cost per unit. The focus then becomes improving how space is used in vehicles and containers. This might involve better pallet building, revised box sizes, or repacking mixed orders to reduce empty gaps.
In last mile and local delivery, Cube Out affects how many stops a van can handle on a route before it has to return to the depot. If vehicles are regularly full by volume, planners may need to adjust service areas, add runs, or use larger vehicles to maintain capacity. Tracking how often routes Cube Out also helps you understand capacity utilization more accurately than weight data alone.
For shippers working with carriers that charge by dimensional weight, Cube Out can mean higher shipping charges even for light goods. Measuring and optimizing cube use can therefore reduce both transport cost and the number of routes required to deliver a given volume.
How SmartRoutes helps with Cube Out and capacity use
SmartRoutes helps teams handle Cube Out by letting them model capacity in terms that match their real constraints, such as number of parcels, cartons, or estimated volume per stop. When planners know that volume, not weight, is the limiting factor, they can set capacity rules in SmartRoutes that reflect how many orders a vehicle can realistically carry on a single route.
By optimizing routes and balancing stop counts against vehicle capacity, SmartRoutes reduces the chances of overloading some vehicles while others leave with unused space. This is especially useful for eCommerce, grocery, and parcel fleets where bulky items cause Cube Out before weight limits are reached. Better loading plans, supported by sequenced manifests and clear route views, also help warehouse teams load vehicles efficiently in delivery order.
Combined with reporting on completed stops, distance, and vehicle usage, SmartRoutes gives operators the data they need to see when they are Cubing Out or under‑using capacity, so they can refine zones, vehicle mix, and route design over time.
Frequently Asked Questions about Cube Out
1. What is the difference between Cube Out and Weigh Out?
Cube Out happens when a vehicle runs out of space before reaching its weight limit. Weigh Out is the opposite: the weight limit is reached while there is still unused space inside the vehicle.
2. What kinds of products usually cause Cube Out?
Light but bulky items such as paper tissue, empty containers, large but light boxes, and some types of packaging or eCommerce freight often Cube Out vehicles long before weight limits are reached.
3. How does Cube Out affect shipping costs?
When shipments take up a lot of space, carriers may use dimensional weight pricing. That means charges are based on the space used rather than just the actual weight, which can increase cost for bulky, light loads.
4. How can we reduce problems caused by Cube Out?
You can review packaging sizes, improve pallet and vehicle loading patterns, choose vehicles that better match your freight profile, and use planning tools that take realistic capacity limits into account when building routes.
5. How does SmartRoutes help when our vans often Cube Out?
SmartRoutes lets you set capacity based on the number or size of orders each vehicle can carry and then plans routes that respect those limits. This reduces overloads, balances work across vehicles, and helps you make better use of available space on every route.
Related terms
Capacity Utilization, Vehicle Capacity, Dimensional Weight, Load Planning, Delivery Efficiency, Route Optimization, Weigh Out