Optimization
Single Box or Multiple Boxes? How to Calculate the Best Packing Plan
“Does everything ship in one box?” is one of fulfillment’s most debated questions. The right answer is sometimes one box, sometimes two smaller ones—sometimes three packages. The best packing plan balances total outer volume, weight, and operational cost—not summed product volume alone.
Decision criteria
The engine evaluates in order: do all items fit in one box in 3D? Is the weight limit exceeded? Do two boxes improve total fill and outer volume? Does the rule engine require a single box or separate packages?
If leftover items remain, the plan is either failed or an additional package is recommended.
Traps of a single box
One large box is sometimes more expensive than two small ones: dim weight jumps and void fill grows. When one item is bulky and another is heavy, separate packages may make sense.
Ship-alone rules (fragile, liquid, lithium, etc.) break the single-box assumption.
Engine behavior
WiCartonize tries multiple box types and split combinations. Deterministic scoring produces the same plan when the same input repeats—critical for pack-bench trust.
Scoring can weight fill rate, box count, cost factors, and business rules.
Operational impact
The pack station knows which SKUs belong in which package. Package count is known before labels in Shopify. Customer support can plan for multiple tracking numbers.
Scenario: multi-package order playbook.
Is minimum box count always the goal?
No. Sometimes three packages cost less than two oversized boxes.
What does leftover mean?
A line that cannot be placed in any legal orientation; operations must intervene.