Fold to Fit

A matching lid begins with a real tray.

Use the open tray for a light rectangular gift. The lid uses the same four-wall construction, turned upside down. Each part has four tabs that glue inside adjacent walls.

Applies to: Fold to Fit prototype · lightweight rectangular gift packaging

Start with the tray

Enter your item’s length and width. Clearance adds room on each side. Wall height is the actual fold height you want; it does not automatically include clearance above the item.

Example inputNominal result
Item: 90 × 60 mmBase: 92 × 62 mm
Clearance: 1 mm per side2 mm total added per axis
Wall height: 25 mmFlat cutout: 142 × 112 mm

Fold, glue and measure again

Cut the outline and keep all four shaded tabs. Score the dashed lines. Raise the walls, fold the tabs inward, and glue them inside the neighboring walls. Allow the glue to set before measuring.

For the lid, use the assembled tray’s OUTSIDE length and width. The tray’s input dimensions and the flat base panel are not its measured outside size.

Dry-fit the four corners

  1. Use scrap paper first. Keep the four tabs attached when cutting the solid outline.
  2. Score the base edges and tab hinges before raising the walls. The shaded areas are tabs, not holes to cut out.
  3. Raise two opposite walls. Turn their tabs inward, then bring the adjacent walls against the tabs. Check that the base is flat and the corners meet without forcing them.
  4. Glue one corner at a time, holding the square shape while it sets. If a corner buckles, check the cut and score positions before changing the dimensions.
  5. Measure the finished tray outside in both directions. Use the widest values for the lid and test it before gluing the final sample.

This is an assembly sequence based on the template geometry, not a report of a completed physical trial.

Make the lid

Switch to Lid and replace the example with your measured outside dimensions. Lid depth controls how far its walls extend down the tray. The example outside size of 93 × 63 mm is illustrative; it is not a prediction of the 90 × 60 mm tray’s assembled size.

If the outside measurement is 93 × 63 mm and you enter 1 mm clearance per side, the lid panel becomes 95 × 65 mm. At 18 mm depth, the flat cutout is 131 × 101 mm. Fold and dry-fit one sample before committing to a batch.

Know the limits

Paper thickness, score width, tab placement and glue can all change the fit. This tool does not model those effects. Physical assembly is pending. These are lightweight craft templates, not tested shipping or load-bearing packaging.

Make your template →

Evidence & verification

Nominal template dimensions are checked in software.

Original calculation · Supported within the stated scope · Fold to Fit v0.5.0 · nominal sleeve, tray and lid geometry; sample and batch exports

  • Calculation tests: Passed · 2026-11-11
  • Exported file checks: Passed · 2026-11-11
  • Physical tests: Not yet checked
  • User tests: Not yet checked

These checks verify nominal geometry and exported coordinates. Printing, paper thickness, glue, physical fit and real-user improvement remain untested.