Two-Piece Lid and Base Peptide Boxes

Why the fit tolerance is the whole design

Lid and base are separate components made to nest. The gap between them is typically a fraction of a millimetre — enough for the lid to travel without binding, tight enough that friction holds it in place.

That tolerance interacts with material. Rigid greyboard is dimensionally stable, so a tight fit stays tight. Folding board flexes and absorbs moisture, so the same nominal gap behaves differently in a humid warehouse. We specify the clearance against the material, not as a fixed number.

• Full-depth lid — The lid covers the base entirely — maximum friction, maximum print area on the lid.
• Partial-depth (shoulder) lid — The lid covers part of the base, exposing a printed band. More forgiving on tolerance.
• Telescoping lid — A deeper lid that adjusts to content height, useful when the fill varies.
• Neck or shoulder insert — A raised inner wall on the base that the lid registers against, giving a positive stop.

Where a two-piece box makes sense

• Multi-vial packs — The base takes the load through its own walls, with no glued flap involved.
• Packing-line loading — An open base is the easiest structure to load, by hand or by machine.
• Presentation without a magnet — The squareness of a rigid box at a lower cost than a magnetic closure.
• Sets with a deep insert — Foam blocks and moulded trays drop straight into an open base.

If the box will be opened and closed repeatedly over a period of use, a magnetic rigid box will hold up better — a friction lid gradually loosens with each cycle.

Sizes and proportions

• Two vials — Commonly around 90 × 60 × 45 mm external.
• Four vials, 2 × 2 — Commonly around 90 × 90 × 50 mm external.
• Ten vials, 5 × 2 — Commonly around 165 × 80 × 50 mm external.
• Twenty cavities, 5 × 4 — Commonly around 165 × 140 × 50 mm external with a foam block.
• Lid depth — Full-depth for maximum hold, or a shoulder lid covering 30–60% of the base height.

Materials

• Rigid chipboard — The usual choice. Dimensionally stable, so the lid fit stays consistent.
• Heavier SBS paperboard — A glued folding two-piece; cheaper, but the fit is less stable over time.
• Kraft board — A plain, unbleached look for laboratory-facing packs.
• Corrugated — For larger two-piece transit cases rather than presentation boxes.
• Recyclable paper-based stock — Available throughout when paired with a paperboard insert.

Dimensional stability is the property that matters most here, and it is a substrate question — the board grades and how each behaves in storage are set out separately.

Inserts

• EVA foam block — Drops into the base as one piece; the easiest insert to load.
• Moulded tray — Sits on a flange or on the base floor, holding vials at a consistent height.
• Partition grid — For higher counts where cost matters more than appearance.
• Wrapped board platform — A raised deck finished in the same paper as the box.

Because the base has four walls, the insert needs no adhesive to stay put — which makes this the easiest structure to pair with a one-piece foam block or formed tray.

Printing across two components

Because the lid and base are separate pieces, they are printed separately — which creates one specific risk worth planning for.

• Colour matching across components — Lid and base printed on different sheets can shift slightly. Spot colours make this far more predictable than process builds.
• Full-colour lid, plain base — The most common and most economical approach.
• Wrapped print on both — A fully coordinated look, at higher cost.
• Inside printing — Available on the base interior and the underside of the lid.

If the lid and base share a solid background colour, specify it as a PMS spot rather than a CMYK build. The reasons are set out on the printing and finishes page.

Finishing

• Matte lamination — Also reduces the friction squeak a tight lid can make.
• Soft-touch coating — Effective on the lid, which is the surface most handled.
• Foil stamping — A logo on the lid face or on the exposed shoulder band.
• Emboss and deboss — Best on rigid board; a debossed lid reads well against a plain base.
• Spot UV — Detail highlight on the lid over a matte base coat.

Ordering

• 1. Contents and insert — The insert height sets the base depth, which sets the lid depth.
• 2. Lid style — Full-depth or shoulder — this changes both the look and the tolerance sensitivity.
• 3. Quote — Two components are priced together against your quantity.
• 4. Sample — Essential on two-piece work; the lid fit has to be felt, not described.
• 5. Production — Both components made, inserts fitted, boxes packed assembled and nested.

Artwork guidance

• Lid and base artwork are separate files on separate die lines.
• On a shoulder lid, check which part of the base band remains visible and design for it.
• Solid colours spanning both components should be spot colours.
• Allow for the wrap turn-in on rigid two-piece boxes.
• Print-ready PDF please, with fonts converted to outlines and links at 300 dpi.

Quality control

• Lid fit is checked across the run, not just at the start — board can drift.
• Loaded samples are lifted by the lid to confirm the base does not drop away.
• Colour is compared between lid and base as a matched pair, not individually.
• Corner squareness is verified on both components.
• Insert fit is confirmed with a real vial.

Delivery

• Rigid two-piece boxes ship assembled and nested, lid on base.
• Folding two-piece boxes can ship flat and be erected on site.
• Inserts are fitted before dispatch unless requested loose.
• Nationwide delivery across the United States.