Custom Tuck End Peptide Boxes

Straight tuck, reverse tuck, auto-lock

These three variants account for almost every folding carton in vial packaging, and they are not interchangeable.

• Straight tuck end (STE) — Both flaps hinge from the same panel — usually the back. The front panel stays uninterrupted, which is why this is the choice when the front is the display face.
• Reverse tuck end (RTE) — Flaps hinge from opposite panels. Slightly cheaper because it nests more efficiently on the sheet, and easier to open one-handed, but a crease line crosses the front panel.
• Auto-lock bottom (crash-lock) — The bottom is pre-glued and locks itself as the carton is opened. Faster to assemble and far stronger under load — the right choice for multi-vial packs.

For a single vial, straight tuck is almost always the answer. Once you are holding four or more filled vials, an auto-lock bottom stops being an upgrade and starts being a requirement.

What a tuck end carton is good at

• Cost — One board, one pass, one glue seam. Nothing else comes close per unit.
• Flat shipping and storage — A pallet of flat cartons holds many times what the same pallet holds assembled.
• Print area — Six clean panels, all flat, all printable inside and out.
• Hand assembly — No tools, no training, a few seconds per carton.
• Die-cut features — Windows, hang holes, tear strips and thumb notches are all straightforward.

Where a tuck end carton struggles

Being honest about the limits saves a reprint later.

• Heavy contents on a tuck bottom — A plain tucked bottom flap will eventually give way under repeated handling. Move to auto-lock.
• Repeated opening — Tuck flaps soften with use. If the box is opened daily, it will not look good by the end.
• Perceived value — A folding carton reads as functional, not luxurious, however well it is printed.
• Empty box collapse — Once the contents are out, the carton loses shape, unlike a rigid build.

Sizing and board specification

• Single vial cartons — From roughly 25 × 25 × 55 mm internal upward, depending on vial size.
• Multi-vial cartons — Sized to the insert footprint plus a small clearance for loading.
• Board caliper — Specified to panel size and content weight; a taller carton needs more caliper than a short one of the same footprint.
• Glue seam position — Placed on a rear vertical edge so it never crosses printed detail on the display face.

Materials

• SBS paperboard — The standard. Clay-coated white, folds cleanly, holds fine print detail.
• Kraft paperboard — Unbleached brown board. Folds well, but print contrast is limited to bolder artwork.
• Recyclable paper-based stock — Where the whole carton must stay in a paper recycling stream, paired with an aqueous coating instead of laminate.
• E-flute corrugated — For larger cartons where a folding board would be too flexible; still tuck-end in principle.

How caliper, coating and fibre direction affect a folded carton is covered in more depth on the packaging materials page.

Inserts inside a tuck end carton

• Die-cut paperboard platform — The natural partner — same material family, ships flat alongside the carton.
• Folded partitions — For multi-vial cartons; each vial gets its own cell.
• EVA foam — Possible, though it partly defeats the flat-shipping advantage of a folding carton.
• Moulded tray — Used where the carton has a window and the vials must sit at a set height.

For a carton that ships flat, a die-cut cardboard insert keeps the whole pack in one material and one shipment.

Printing a folding carton

• CMYK process — Full-colour artwork across all six panels.
• PMS spot colour — For brand-critical solids that must match across repeat runs.
• One- and two-colour — Where unit cost matters most — common on research and distributor cartons.
• Inside printing — A second pass on the reverse of the board; visible when the flaps open.

Finishing

• Matte lamination — The most common. Adds scuff resistance and a calm surface.
• Gloss lamination — Higher colour saturation for image-led artwork.
• Aqueous coating — A lighter seal that keeps the carton in a paper recycling stream.
• Spot UV — Gloss detail over matte; works well on a logo or a molecular graphic.
• Foil stamping — Possible on folding board, though the effect is flatter than on rigid board.
• Emboss and deboss — Shallow effects only — folding board cannot hold a deep impression.

Die-cut features worth considering

• Window with film patch — A clear panel showing the vial; see window peptide boxes.
• Thumb notch — A small die-cut that makes the flap easier to lift.
• Tear strip — A perforated opening line, which also acts as a simple tamper indicator.
• Hang hole — For cartons displayed on a peg.
• Locking tuck flap — A shaped flap that resists opening in transit.

Ordering

• 1. Vial, count and weight — These decide whether you need a plain tuck or an auto-lock bottom.
• 2. Structure and quote — We propose a variant and price it at your quantity.
• 3. Die line — A flat die line showing panels, folds, bleed and glue seam.
• 4. Digital proof and sample — Colour on screen, then a physical carton you can fold and load.
• 5. Production — Printed, laminated, die-cut, stripped, glued, counted and packed flat.

The complete process with timings and responsibilities at each stage is on the how to order page.

Artwork guidance

• Never redraw the die line — use the file we supply, at 100%.
• Keep critical content 4 mm inside every fold and trim edge.
• Remember the glue seam overlaps the rear panel; artwork there will be partly hidden.
• Extend background colour 3 mm beyond every trim edge, including into the flaps.
• Supply print-ready PDF with outlined fonts and 300 dpi linked images.

Quality control

• Cartons are erected from the run and checked for square.
• Glue seams are pull-tested.
• Auto-lock bottoms are loaded and checked on sample cartons.
• Print-to-die registration is verified, which matters most on window cartons.
• Colour is monitored against the approved proof or PMS reference.

Delivery

• Cartons arrive flat, banded in counted bundles inside corrugated outer cases.
• Inserts and partitions arrive flat in the same shipment.
• Flat delivery means low storage volume and low freight cost.
• Nationwide delivery across the United States.