Flexible Vial Caps for Peptide, GLP-1 & Insulin Vials
Reusable Protective Dust Covers for 3ml, 5ml, 10ml, 30ml, 50ml & 100ml Vials
Vial Size Chart
Vial sizes refer to liquid capacity. Below are the approximate dimensions of each common vial — match your vial to the size this case is built for.
| Vial Size | Approx. Size (Ø × H) | Common Contents |
|---|---|---|
| 1 mL | 11 × 32 mm | Insulin, small peptides |
| 2 mL | 14 × 35 mm | Peptides, GLP-1 (semaglutide/tirzepatide) |
| 3 mL | 16 × 35 mm | Peptides, GLP-1, BPC-157, TB-500 |
| 5 mL | 20 × 38 mm | HGH, HCG, larger peptides |
| 10 mL | 22 × 50 mm | BAC water, testosterone, reconstitution |
| 20 mL | 30 × 57 mm | BAC water, multi-dose vials |
| 30 mL | 36 × 63 mm | Large BAC water, bulk |
| 50 mL | 40 × 75 mm | Bulk storage |
| 100 mL | 52 × 95 mm | Bulk storage |
Dimensions are approximate and vary slightly by manufacturer. Ø = diameter, H = height (excluding cap). When in doubt, measure your vial’s widest point and height.
- Snug snap-on fit that stays put
- Keeps dust & debris off your stoppers
- Color-code & identify vials at a glance
- Reusable — fridge & freezer safe
- Ships in 24–48 hours
You picked a Blemished item
This version has a minor cosmetic or print defect — a small mark, blemish, or imperfection from the 3D-printing process. It’s offered at a lower price because we can’t sell it as new.
- 100% functional — protects your vials exactly the same.
- Cosmetic flaw only — appearance varies slightly unit to unit.
- Discounted & final sale.
Customer Reviews
Real, verified reviews and photos from VialCase customers.
Cute tops
It's a perfect fit for the 3ml vial
Material: Strong and durable reusable
Design: Amazing design.
Characteristics: Perfect color. Looks like a honey cone top.
Size: Fits 3ml. Vials perfectly
Caps fit perfectly! Love the colors, will keep my peppers safe! Thank you!
Working well. Fit perfect for the vials at least the small one.
Customer rated 5 out of 5 — no written review
Flexible Vial Caps are the original reusable protective caps for GLP-1, peptide, insulin, essential oil, and research vials. Trusted by tens of thousands of customers, these flexible caps shield vial tops from dust, debris, scratches, and everyday handling during storage and transport.
Designed with a secure friction-fit, Vial Guard caps are easy to apply, remove, clean, and reuse — helping keep your vials sealed, labeled, and organized.
Why customers choose Flexible Vial Caps
- Universal fit — 3mL, 5mL, 10mL, 30mL, 50mL, and 100mL sizes to fit standard 13.5mm–20mm vial necks.
- Reusable & durable — wash and reuse again and again instead of single-use foil seals.
- Color coding — 18+ colors let you organize doses, compounds, and patients at a glance.
- Travel ready — keep stoppers clean and protected in a fridge, bag, or travel case.
Compatible with
GLP-1 medication vials, peptide and research vials, insulin vials, BAC water, essential oils, and most 3mL–100mL glass vials.
Made in the USA. Ships in 24–48 hours.
Shipping
- Free shipping on all orders over $49.
- Made to order — ships in 24–48 hours.
- Tracking provided on every order.
Returns
- 30-day money-back guarantee — love it or return it.
- No-questions-asked returns on unused items.
- Contact us and we'll make it right.
Why VialCase vs. a Generic Box
Built for vials — not a repurposed tackle box.
| Feature | VialCase | Generic Storage Box |
|---|---|---|
| Custom-fit vial slots | ✓ | ✗ |
| Hard-shell impact protection | ✓ | ✗ |
| Fridge & freezer safe | ✓ | ✗ |
| Dedicated BAC water slot | ✓ | ✗ |
| Made in the USA | ✓ | ✗ |
| 30-day money-back guarantee | ✓ | ✗ |
| 1,400+ verified reviews | ✓ | ✗ |
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