Custom Vial Caps: Color-Code and Label Your Vials at a Glance

Updated October 4, 2026 · 2 min read

Short answer

with the PeptideCase™ cap builder you design caps for 3 mL or 10 mL vials. Choose a cap color, a mark color, and an icon or one or two letters, then order a set from 25 caps in steps of 5. Mixing designs in one set lets you color-code a whole collection.

Why custom caps?

When vials look alike, the cap is the quickest thing to read, especially in a case where you look down on the tops. A color plus an icon or letter tells vials apart instantly, without lifting each one out.

Design your vial caps

Pick a cap color and an icon or letters, then order a set.

Design your caps →

Design options

Cap size: 3 mL or 10 mL.
Cap color: from the palette shown in the builder.
Mark: an icon from the library, or one or two letters.
Mark color: a contrasting color so the mark stands out.
Quantity: each design in steps of 5. Sets run from 25 to 500 caps.

Planning a color-code system

Give each vial type its own cap color.
Add a letter or icon for the sub-type.
Note the system on a card in your case, so everyone reads it the same way.

Pair them with a custom case

Caps are easiest to read in a case where vials stand in neat rows. See how to build a custom vial case.

Frequently asked questions

What are the caps made of?

They're printed in a flexible material that grips the vial.

What's the minimum order?

25 caps per set, in steps of 5 for each design.

Can I mix designs in one set?

Yes. Add several designs to the same set.

Ready to design yours?

Add what you carry, pick a color and latch, and see your case in 3D. It's printed to order to fit exactly.

Design your case →

PeptideCase makes storage cases and caps only. We don't sell, recommend or give advice about any medication or compound. Follow the storage instructions on your product label or from your pharmacist or provider.