Practical planning guide

Partial Last Layers and Loaded Envelopes: Count Cases Separately from Cube

Compare two partial-layer arrangements with identical case quantities and different outside heights without treating a whole-layer tool as a tail-layout solver.

Reviewed: 1 October 2026

Decide which height describes the last pallet

A full-pallet specification gives a convenient TI and HI, but an order rarely guarantees that every pallet is full. The last case quantity does not uniquely determine its layer arrangement or outside cube. A partial top layer can leave substantial empty space inside the loaded envelope. Keep the actual case count, proposed partial arrangement, and measured total height as separate records.

Use a fictional complete specification with TI eight and five 250 mm case layers above a 144 mm base. Cases measure 400 by 300 by 250 mm. The pallet footprint is 1200 by 800 mm, with permitted horizontal rotation and zero spacing. Full capacity is forty, and its height is 1394. These values describe an arithmetic model, not a permitted packaging stack.

Compare two envelopes for the same fifteen cases

A ninety-five-case order at forty per complete pallet produces two full pallets and a fifteen-case tail. Fifteen divided by eight requires at least two layers if no layer exceeds eight. One hypothetical arrangement is eight cases below seven, giving two case-height levels and a nominal total height of 644 mm. Another is five cases on each of three levels, giving 894 mm. Their physical support and securement have not been approved by this calculation.

Two stated partial arrangements, one unchanged case count
Tail proposalCasesHeight including baseSum of case volumesLoaded envelope cube
8 + 7 across two levels15644 mm0.45 m³0.61824 m³
5 + 5 + 5 across three levels15894 mm0.45 m³0.85824 m³

The case volume sum is fifteen times 0.4 times 0.3 times 0.25 = 0.45 cubic metre in both proposals. The rectangular loaded envelopes differ because their heights differ. The higher three-level envelope reserves 0.24 cubic metre more under the stated footprint. Cube is therefore not a direct transformation of case count alone.

Use known dimensions for a stated or measured tail

Open the 644 mm known envelope and the 894 mm known envelope. Known mode calculates outside cube and does not infer TI, HI, or fifteen cases. Identify whether those dimensions are proposed geometry or actual completed-load measurements.

Build from Cases with TI eight and two complete layers would calculate sixteen cases, not fifteen. It repeats a full layer. Do not copy that full-layer case volume into the tail record and label it actual. The hypothetical two-level product-stack envelope is 0.48 cubic metre, but the actual fifteen case envelopes sum to 0.45; the missing case position accounts for a 0.03 difference before the base region is included.

Reconcile tail mass independently

Assume packed-case mass 12 kg, tare 25 kg, and 3 kg extras per carrier. Both fifteen-case proposals weigh 15 times 12 + 25 + 3 = 208 kg gross under those unchanged components. The complete forty-case pallet weighs 508 kg. Two complete loads plus the tail total 1224 kg, also ninety-five times twelve plus three times twenty-eight.

Use the capacity-based ninety-five-case record to reproduce the case groups and weights. The weight tool does not choose the tail's partial layer arrangement. It also assumes the same tare and extras for its groups, which must be replaced or separately reconciled when the actual tail uses different protection.

Keep shipment cube grouped by actual envelope

A full envelope is 1.2 times 0.8 times 1.394 = 1.33824 cubic metres. Two such loads and the 644 mm tail total 3.29472 cubic metres. With the higher 894 mm tail, the total is 3.53472. Copying the full height to all three would report 4.01472, a different assumption from either stated partial proposal.

Retain each envelope group and its count rather than a single average height. The tallest individual load matters to an opening check, and the floor footprint may remain unchanged for the lower tail. A total cube does not establish that these objects fit a floor arrangement or that any are stackable on one another.

Include the whole carrier in a partial measurement

A partial set of cases may occupy a narrower region than the base, but the moved object still includes the base itself. Do not measure only the carton cluster and reserve a footprint smaller than its actual carrier. The 1200 by 800 footprint in these examples is therefore retained for the whole envelope. If a different smaller carrier is actually selected, record that changed base, tare, and protection as a new arrangement rather than shrinking the old envelope mathematically.

Review which partial positions are occupied

A valid eight-case full-layer drawing can provide reference positions, but it does not decide which one to omit for seven or which five to occupy for a shorter partial layer. The location of gaps and support between levels can matter physically. Record the proposed occupied coordinates and obtain the relevant packaging review rather than treating any subset of a dense pattern as automatically suitable.

Final protection can enlarge the footprint or height beyond the nominal arithmetic. Measure the completed object when those dimensions matter. Case bulge, top caps, sheets, or wrapping are not inferred from the fifteen-case count. A tail's final measured envelope is a separate observation and should retain its measurement basis.

Partial-tail record

Order 95; accepted complete capacity 40; two full loads and 15 tail cases. Case 400 by 300 by 250 mm, packed mass 12 kg. Base footprint 1200 by 800, height 144, tare 25, extras 3. Compare stated tail arrangements 8+7 and 5+5+5. Nominal heights 644 and 894; cubes 0.61824 and 0.85824; identical gross 208. Partial coordinates, package support, and final measured envelope remain separate evidence.

The useful handoff states both how many cases ship and which outside rectangle is being checked. That preserves the order reconciliation without asking a complete-layer volume model to invent a partial arrangement.

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