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 | Small vials |
| 2 mL | 14 × 35 mm | Standard vials |
| 3 mL | 16 × 35 mm | Standard vials |
| 5 mL | 20 × 38 mm | Larger vials |
| 10 mL | 22 × 50 mm | Bottles & diluents |
| 20 mL | 30 × 57 mm | Multi-dose bottles |
| 30 mL | 36 × 63 mm | Large bottles, 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.
Great quality of product caps fit well definitely buy more
It fits like it’s supposed to with zero problems.
Good simple usefull 👌
Fits perfectly and keeps my peptide vials clean and protected. Great quality!
Love these keeps the tops clean
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 diluent-bottle slot | ✓ | ✗ |
| Made in the USA | ✓ | ✗ |
| 30-day money-back guarantee | ✓ | ✗ |
| 1,600+ verified reviews | ✓ | ✗ |
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