Shipping Flat Cardboard Boxes Freight Class Guide
Flat Cardboard Boxes typically classify around Class 110, in the 6-10 lb/ft³ density range. Knocked-down corrugated boxes, bundled.
Calculate Flat Cardboard Boxes Freight Class
Enter your actual shipment dimensions and weight below. Typical flat cardboard boxes run 500-800/bundle lb, but your exact class depends on your specific shipment's measured density.
Measure the full footprint including packaging, and include pallet weight in your total. Carriers will re-measure at the terminal.
Shipping Flat Cardboard Boxes the Right Way
Bundling Keeps Density Consistent
Flat cardboard stacks tightly and predictably once banded into a bundle, which keeps density, and therefore freight class, more consistent shipment to shipment than almost any other paper and packaging commodity on the road.
Edges Crush Before Anything Else
The corrugated edges of a flat box bundle are the first thing to crush under uneven stacking or a shifted load, so keeping bundles square and fully strapped prevents the bent-corner damage most common on this freight.
Strap Tension Affects the Footprint
Loosely strapped bundles can splay slightly at the edges, adding a small but real amount of measured volume, so tight, even strap tension keeps the bundle's footprint, and its calculated density, as accurate as possible.
Flat Cardboard Boxes: What Carriers and Shippers Look For
Knocked-down cardboard boxes ship flat and bundled rather than assembled, which keeps their footprint compact relative to weight and lands most shipments around Class 110. The bundling itself does most of the work protecting the shipment, since flat corrugated sheets have little to damage beyond crushed or bent edges. The main planning consideration is bundle count and strap integrity rather than the kind of fragile-item handling that drives class and claims on assembled packaging freight.
Why Flat Cardboard Boxes Classify Around Class 110
Bundled flat cardboard typically runs 6 to 10 pounds per cubic foot, a moderate density that reflects tightly stacked corrugated sheets with very little air gap between them. That places most shipments around Class 110, comfortably mid-range and notably cheaper than the finished, assembled boxes the same material becomes later in the supply chain. Bundle weight and sheet count both scale together fairly linearly on this commodity, which makes density, and the resulting class, one of the more predictable figures in the paper and packaging category.
Bundling Tips That Protect the Class
Squared, evenly stacked sheets within each bundle keep the footprint tight and the strap tension effective, both of which help keep measured density, and the declared class, consistent from load to load.
Corner boards or edge protectors under the straps prevent the strapping itself from cutting into the top and bottom sheets of the bundle, which otherwise produces the kind of crushed-edge damage that generates claims on an otherwise low-risk commodity.
Equipment and Handling Notes
Dry van is standard for flat cardboard freight, and bundles handle well with a standard forklift given their uniform, palletized shape. Bundles should be stacked no higher than the strapping and bundle rigidity support, since flat cardboard has little structural strength of its own once removed from its original stack height.
Common Shipping Mistakes
Over-stacking bundles beyond their rated stack height is the most common mistake, since flat cardboard has almost no compressive strength on its own and will bow or crush under excess weight from above.
The second mistake is loose or uneven strapping, which lets bundles splay at the edges during transit and produces damaged, unsellable sheets even when the load itself never shifted.
Related Paper & Packaging
Carriers Hauling Flat Cardboard Boxes
“Flat cardboard is about as low-drama as freight gets, as long as the straps are tight. Loose bundles are the only thing that ever slows me down.”
“I check bundle squareness before I load anything else on this freight. A leaning bundle tells you the straps already gave a little.”