Custom 3ml Peptide Vial Boxes

Why 3ml sits awkwardly between two sizes

A common 3ml vial runs close to 16 mm across the body with a height near 45 mm, against roughly 35 mm for a 2ml in the same family. Ten millimetres does not sound like much, but in a carton it is the difference between a vial sitting inside the insert and a vial sitting on top of it.

The other complication is supplier drift. Two vials both sold as 3ml can differ in shoulder profile, neck length and cap diameter. Cavities cut to one supplier's shoulder can grip the next supplier's vial too high, which puts load on the crimp instead of the glass body.

• Height, not width, is the variable — Plan headspace from the top of the cap and leave a small clearance so the lid never presses on the seal.
• Shoulder profile matters — A gently sloped shoulder needs a slightly larger cavity opening than a square-shouldered vial of the same diameter.
• Cap diameter drives the opening — On a die-cut paperboard insert, the vial has to pass cap-first through the hole, so the hole is sized to the cap.

Typical buyers and how they use this size

3ml tends to appear where a slightly larger reconstituted volume is wanted but the pack still has to feel compact.

• Multi-dose research supply — Cartons printed with reference codes, batch fields and storage notes.
• Aesthetic and wellness brands — Six- and ten-count presentation boxes where the row of vials is the visual.
• Contract fillers — A single carton design run across several customers, differentiated only by the printed label.
• Kit builders — A 3ml active paired with a diluent vial in the same box; see two-vial kit boxes for that layout.

Sizes and layout options

Because 3ml vials are taller than they are wide, the count you choose changes the carton proportion more than it does at 2ml. A row of six 3ml vials makes a long, shallow box; two rows of three makes a squarer one that ships better.

• Single vial — Commonly around 25 × 25 × 62 mm internal for a tuck carton with a paperboard insert.
• Two vials, side by side — Commonly around 45 × 25 × 62 mm internal.
• Six vials, single row — Commonly around 115 × 25 × 62 mm internal — elegant, but a long box to post.
• Six vials, two rows of three — Commonly around 60 × 50 × 62 mm internal, and noticeably cheaper to ship.
• Dual-fit insert — One cavity diameter, two cavity depths, letting a 2ml and a 3ml vial both seat correctly.

Choosing a material for a mid-height carton

At 45 mm tall the vial column starts to act as a lever, so panel stiffness matters more than at 2ml — particularly for multi-count boxes where the long panels are unsupported.

• SBS paperboard — Strong enough for counts up to about six vials, with a print surface that handles fine type and gradients.
• Rigid chipboard — The right answer when the box is the presentation and you want the walls to stay perfectly square.
• Kraft paperboard — Suits a stripped-back look; combine with one-colour printing rather than fighting the board tone.
• Recyclable paper-based stock — Where the whole pack needs to go into a paper recycling stream, paired with a paperboard insert rather than foam.

Board choice, caliper and where each substrate stops making sense are covered in the packaging materials guide.

Insert strategies for 3ml

The taller vial gives an insert more to hold on to, which opens up options that are marginal at 2ml.

• Full-depth foam block — A milled cavity that surrounds most of the vial body. The most secure option and the best-looking when the box is opened.
• Die-cut platform — A raised paperboard deck with a punched hole. Light, recyclable and fine for boxes travelling inside an outer case.
• Twin-wall partitions — Folded paperboard cells for multi-count boxes; each vial sits in its own compartment with no shared walls.
• Moulded tray — Ideal where vials must be visible through a window or presented at a consistent angle.

For six vials and up, partitions usually beat a single large foam block on cost without giving up much protection — the reasoning is set out in our note on how custom inserts reduce vial movement.

Print options

• CMYK process — For photographic backgrounds, gradients and molecular graphics.
• PMS spot colour — Holds a brand colour steady across reprints — worth it if the carton sits beside others in a range.
• Two-colour — A spot brand colour plus black covers most clinical layouts at lower cost than full process.
• Inside printing — Works well on a 3ml box because the inner lid is visible when the vials are lifted out.

Finishing options

• Matte lamination — A calm, clinical surface that resists fingerprints.
• Soft-touch coating — Adds perceived value on presentation boxes; pairs well with foil.
• Spot UV — Use on a logo or a single graphic device over a matte base for contrast.
• Foil stamping — Effective on the lid of a two-piece or rigid box in gold, silver or a coloured foil.
• Embossing and debossing — Best on rigid board, where there is enough thickness to hold the impression cleanly.
• Aqueous coating — A light protective seal where lamination is not wanted for recyclability reasons.

Structures we build for 3ml

• Straight and reverse tuck end — Economical, ships flat, suits counts up to about six.
• Two-piece lid and base — A separate lid and base that feels substantial; see two-piece lid and base peptide boxes.
• Sleeve and tray — A drawer action that shows the vial row as the tray slides out.
• Rigid magnetic — For premium sets where the box is kept after the vials are used.

Ordering a 3ml box

• 1. Confirm the vial — Send a sample or a supplier drawing. If you run two fill volumes, send both vials.
• 2. Fix the count and layout — We will show you the shipping cost difference between a single row and a two-row layout.
• 3. Die line and proof — Artwork is laid onto our flat die line and returned as a digital proof.
• 4. Fit sample — A physical sample is made and the real vial is seated in it.
• 5. Production — The approved job is printed, die-cut, glued and packed flat.

Artwork notes specific to this size

• Long single-row cartons have a very shallow front panel — check that your logo lock-up still works at that proportion.
• If the box has a tray, remember the tray flange hides a few millimetres of the base panel.
• Place batch and lot fields where they will not be obscured by a tuck flap.
• Supply print-ready PDF, fonts outlined, 300 dpi images, 3 mm bleed.

Full file requirements, including how we handle spot colours and overprint, are on the artwork guidelines page.

Quality control

• Approved proof and approved physical sample are both used as references during the run.
• Cavity depth is checked on multi-depth inserts so both vial heights seat correctly.
• Partition cells are spot-checked for square assembly.
• Colour is monitored against the signed proof or PMS reference.
• Finished cartons are counted and inspected before packing.

How your boxes arrive

• Folding cartons and partitions are supplied flat.
• Foam inserts are supplied cut to size, loose or pre-fitted on request.
• Rigid and two-piece boxes ship assembled with layer protection.
• Everything is packed into corrugated outer cases and shipped anywhere in the United States.