MC Vault 10 Adapter - 3mL to 10mL Vial Adapter Sleeve for Zepbound, Insulin & Peptide Vials

Your 3mL vials shouldn't need a whole separate case just because they're smaller. The MC Vault 10 Adapter is a precision-fit 3mL to 10mL vial adapter sleeve. It sizes standard 3mL medication vials, including Zepbound 3mL vials from LillyDirect, up to the footprint of a standard 10mL vial. Drop the 3mL vial into the adapter, drop the adapter into your 10mL vial case, and everything lives in one place instead of two. No rattling, no wobbling, and no improvised paper towel situations.

The short version

Fits: standard 3mL medication vials, including Zepbound 3mL LillyDirect vials. Designed for the 10mL version of the MC Vault and the JP CryoCan 10mL, and works in other cases with standard 10mL vial receptacles.

Why this beats buying a second case

• One case, both sizes. Store 3mL and 10mL vials side by side instead of splitting them across two cases.
• No wobble. The sleeve holds a smaller vial centered in a 10mL slot, so it doesn't tip or rattle around.
• Mix and match. Use as many or as few as you need. Swap slots between 3mL and 10mL whenever your supply changes.
• Built to last. Rigid plant-based bioplastic, lightweight and purpose-built.
• Made here. Designed, printed, and shipped from Michigan.

Who it's for

Anyone who already has a 10mL vial case and picked up some 3mL vials, or anyone who switches between vial sizes and wants one case that handles both.

Quick answers

Does it come with a case?

No. This is the adapter only. Vials, medication, and the storage case are sold separately.

How many do I need?

One per 3mL vial you want to store in a 10mL slot. Not sure? Shop all cases here, or message us and we'll sort it out before you order.

What color are they?

White. If you need a special color run, message us.

How do I clean them?

Hand wash with cool water and mild dish soap. They're not dishwasher safe, and they shouldn't be left in a hot car or direct sunlight.

Storage accessory only. Vials, medication, and storage case not included. Always follow your healthcare provider's instructions and the manufacturer's storage guidelines for your medication. Zepbound is a trademark of Eli Lilly and Company. Massive Customs is not affiliated with or endorsed by Eli Lilly and Company.