How the illustrative cartonization heuristic works
The studio begins with unpacked product facts and expands quantity into individual items. It adds the displayed protection allowance, calculates each protected item's exterior cube, weight, longest side, and length plus girth, and then assigns the item to exactly one provisional handling unit.
- Parcel candidate: an item that remains within the selected 108-inch longest-side, 165-inch length-plus-girth, and 150-pound maximum-package screen becomes one carton. Surcharge flags can still require review.
- Selected-profile pallet: an over-maximum parcel item whose protected footprint and height fit the selected planning envelope enters the pallet assignment.
- Custom review: an over-maximum parcel item that does not fit the selected pallet footprint or maximum height is separated instead of being forced into that pallet.
- Exactly-once assignment: fragile pallet freight receives a dedicated provisional pallet. Other eligible freight is sorted by protected height and placed as separate vertical layers using a first-fit-decreasing heuristic.
- Unit math: a planned pallet's contents and weight come only from its assigned items, plus a visible illustrative 45-pound pallet tare.
The model does not assume that two freight items can sit safely side by side. It treats each pallet item as a full layer, never stacks another item above a fragile line, and stops at the selected height. That can use more pallets than a warehouse-approved plan.
Planning footprint is an input—not a universal answer
The 48 × 40, 48 × 48, 42 × 42, and 24 × 40 choices are planning profiles for comparison. The 48 × 40 choice is labeled as a common U.S. GMA planning footprint; none is presented as a universal carrier requirement, a certified load design, or the cheapest pallet. The selected maximum height includes a 5.5-inch illustrative pallet deck.
A real decision also needs pallet condition and capacity, product orientation, load distribution, overhang, compression, center of gravity, handling equipment, securement, warehouse rules, carrier rules, and delivery requirements. The NWPCA standard linked below is a useful wood-pallet reference, but it does not approve this plan.
What the 2026 parcel screen checks
The current public screen uses selected U.S. package breakpoints published by UPS and FedEx. More than one flag can apply to the same carton. Carrier names for the second category differ—UPS calls it Large Package and FedEx calls it Oversize Charge—so the studio uses the combined label only as a screening shorthand.
| Screen | Longest | Second side | Length + girth | Cube | Weight |
|---|---|---|---|---|---|
| Additional Handling | > 48 in | > 30 in | > 105 in | > 10,368 in³ | > 50 lb |
| Large / Oversize | > 96 in | — | > 130 in | > 17,280 in³ | > 110 lb |
| Selected maximum-package screen | > 108 in | — | > 165 in | — | > 150 lb |
The first two rows are surcharge-category screens, not hard shipping ceilings. The third row is used only to stop the public model from describing a larger item as a parcel candidate. Packaging, service, dimensional weight, demand charges, unauthorized-package rules, contracts, and carrier acceptance remain outside this tool.
Open the carrier-specific freight and parcel threshold checker for a separate, source-visible ODFL, Estes, UPS, and FedEx review.
Density is a reference—not a class assignment
The plan divides protected shipment weight by planned exterior handling-unit cube and locates that density in NMFTA's public 13-band full-scale table. The displayed class is therefore labeled “reference class.” It does not replace the current NMFC item or the handling, stowability, liability, packaging, carrier, and customer-agreement facts that can determine billable treatment.
After packing, capture the finished exterior dimensions, scale weight, packaging, photos, orientation, stackability, and service requirements. Compare that actual record with the earlier plan and later carrier bill; do not overwrite the prediction with the outcome.
Cartonization Studio FAQ
Is this cartonization plan a warehouse packing instruction?
No. It is a browser-based planning model. A warehouse still has to approve the carton, pallet, crate, orientation, protection, stackability, load capacity, equipment, and service conditions for the actual order.
How does the model prevent an item from appearing on several pallets?
The cart quantity is expanded into individual items. Each parcel or custom item becomes one unit, and each pallet-eligible freight item is assigned once to one provisional pallet. Fragile freight receives a dedicated provisional pallet; other eligible freight uses a first-fit, protected-height layer heuristic.
Are the four pallet footprints universal freight standards?
No. They are selectable planning profiles. The 48 by 40 option is labeled as a common U.S. GMA planning footprint; none of the profiles is represented as carrier-required, warehouse-approved, or the lowest-cost choice.
Does the displayed NMFTA reference class determine the billable freight class?
No. It only locates the calculated shipment density in NMFTA's published full-scale density table. The current NMFC item, handling, stowability, liability, packaging, carrier rules, and customer agreement still control the transportation treatment.
Does passing the parcel screen make the package eligible or priced?
No. The screen checks selected 2026 UPS and FedEx numerical surcharge and maximum-package breakpoints. It does not select a service, apply a contract, calculate dimensional weight, guarantee acceptance, or return a rate.
What should replace the illustrative plan after packing?
Record the actual finished handling units: exterior dimensions, scale weight, packaging, photos, orientation and stackability notes, and service requirements. Keep the predicted plan and the actual packout as separate records so the quote-to-bill review can learn from the difference.
Official sources and claim limits
Sources were reviewed August 16, 2026. They support the named public calculations and threshold screens; they do not validate a merchant's inputs, approve a packout, assign freight class, return a rate, or guarantee carrier acceptance. Recheck the current publication and the applicable customer agreement before tender.
- NMFTA — How is the density of a handling unit calculated? ↗Supports the pounds-per-cubic-foot calculation using the ready-to-ship handling unit, including pallet and packaging.
- NMFTA — Decoding Density ↗Publishes the 13-band full-scale density reference and explains that density is not the only NMFC transportation characteristic.
- NMFTA — How shippers can prepare for the 2025 NMFC changes ↗Explains the July 19, 2025 shift of more than 2,000 items to the expanded density scale and the need for accurate dimensions and weight.
- National Wooden Pallet & Container Association — Uniform Standard for Wood Pallets ↗Provides an industry reference for wood-pallet design, performance, manufacture, and testing; it does not make one selectable footprint universally correct.
- UPS — Avoid additional shipping fees ↗Lists the selected 2026 U.S. Additional Handling and Large Package size-and-weight criteria used in the parcel screen.
- FedEx — 2026 Service Guide ↗Lists the selected 2026 U.S. package Additional Handling and Oversize Charge criteria used in the parcel screen; see the package surcharge tables on pages 127–128.