3 mL vs 10 mL Vials: Choosing Pocket Sizes for a Custom Case
Updated October 4, 2026 · 2 min read
Short answer
pick 3 mL pockets for small vials and 10 mL pockets for larger ones. Use the slim 10 mL pocket if your 10 mL vials are narrow. One custom case can mix all three, and the builder keeps each size grouped in a tidy block.
The three pocket types
Pocket
Use it for
3 mL
Small vials, the most common size
10 mL
Standard-width larger vials
Slim 10 mL
Narrower 10 mL vials that would wobble in a standard pocket
Design your case in a few minutes
Add what you carry, pick a color and latch, and check it in 3D before you order.
When a case holds more than one size, the planner tries vial-first and bay-first arrangements and keeps the neatest one. You'll usually see one block of 3 mL pockets and one block of 10 mL pockets.
Height: short vials are raised
Smaller vials are raised inside their pockets so their tops sit at a similar height to the larger vials. Every vial stays easy to grip and lift out.
How many spares?
Fixed routine: match your count exactly.
Changing collection: add one or two spare pockets of each size.
Frequently asked questions
Will a 3 mL vial fit in a 10 mL pocket?
It would be loose. Use the right pocket size so vials can't move.
Can I change sizes after ordering?
Each case is printed to your design, so check the pocket counts in the preview before you order.
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.
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.
