Step 3
Dimentions
Step 3 of 7
Enter the box dimensions (mm)
Enter the dimensions of the assembled box in millimeters (mm). These are the dimensions of the finished 3D box, not the flat dieline. If fit is critical, inside dimensions are usually best—just note “inside” in Step 6.
Tight-fit packaging
If your product must fit precisely (cosmetics bottle, glass, pump, multiple parts), use inside dimensions and allow realistic clearance. Tight-fit custom packaging often needs small tolerances to avoid scuffing, snagging, or packing friction.
Multi-item set
For sets (2+ items), enter the outer box dimensions, then describe the inside layout in Step 6 (e.g., “2 items side-by-side”, “stacked”, “needs divider/insert”). This helps spec an insert and prevents a box that looks right on paper but doesn’t pack well.
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Guide on filling the fields
Fill the fields
Fill Width, Height, Length
Be consistant
Width – Front face width
Height – vertical
Length – depth (front to back)
If not sure
If not sure – Outside or inside Dimentions, estimate and specify in Step 6
Common mistakes
Using cm instead of mm
Entering the flat dieline size instead of assembled box size
Swapping width/length between Box tabs
Forgetting space for inserts, padding, or closing tolerances
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