What Is 30 mL Bacteriostatic Water Vials (Hospira-Style Multi-Dose)?
30 mL is the classic multi-dose format popularized by the Hospira (now Pfizer) drug product and carried by most resellers. It is a legitimate format — sterile, 0.9% benzyl alcohol, multi-dose — and for high-throughput work that genuinely consumes 25+ mL within the in-use window it is efficient. Most 30 mL vials sold to individual research buyers, however, are priced per vial at reseller markups and end their 28-day window partly full, which quietly raises the true cost per mL actually used.
Side-by-Side Specification
| Criterion | Bacteriostatic Water (BW-10) | 30 mL Vials |
|---|---|---|
| In-Use Window After First Puncture | 28 days — vial typically finished within it | Same 28 days — size grants no extension |
| Typical Discarded Volume (research draw rates) | Low — right-sized to the window | 10–15+ mL commonly unused at day 28 |
| Septum Punctures Per Vial | Fewer — fresh septum sooner | Several times more over the window |
| Contamination Blast Radius | One vial = 10 mL at risk | One breach compromises 30 mL |
| Per-Lot CoA Cadence | Every fresh vial re-anchors to a tested lot | One lot for a month-plus of draws |
| Cost Per mL Actually Used | $0.65–$1.00 (bulk to single) | Reseller 30 mL at $27–$39 ≈ $1.35–$1.95/mL if a third is discarded |
| Supply Model | Direct from ISO 9001:2015 US manufacturer | Typically resold pharmacy stock |
| Availability Documentation | Published per-lot third-party CoA | Package insert; per-lot CoA rarely provided to buyer |
When to Use Bacteriostatic Water
Preferred for typical research reconstitution workflows — intermittent draws of 1–3 mL across a month. The vial size matches the in-use window, so preservative efficacy, septum integrity, and lot traceability all stay inside their tested envelope, and nothing tested gets poured down the drain at day 28.
View BAC Water Depot 10 mL specification · single vials from $9.99, bulk from $6.49 per vial.
When to Use 30 mL Vials
Justified when a protocol genuinely consumes most of 30 mL within 28 days — high-throughput reconstitution, batch prep, or shared-bench usage — and the buyer can verify the product is the genuine pharmaceutical article with an intact cold-chain and lot documentation. If a 30 mL vial routinely hits its discard date half-full, the format is costing more per used mL than it appears.
Frequently Asked Questions
Does a 30 mL bacteriostatic water vial last longer than a 10 mL vial?
Not in time — both are governed by the same 28-day in-use convention after first puncture. A 30 mL vial only "lasts longer" if your draw rate actually consumes it within that window; otherwise the extra volume is discarded, not used.
Is it cheaper to buy 30 mL vials?
Per labeled mL, sometimes. Per mL actually used, often not: reseller 30 mL vials commonly sell for $27–$39, and discarding a third at day 28 puts the effective cost at $1.35–$1.95 per used mL — above a $9.99 10 mL vial fully consumed, and well above bulk 10 mL pricing at $6.49 per vial.
Why do suppliers push 30 mL as the standard?
It is the legacy pharmacy format — the Hospira drug product ships in 30 mL, so resellers stock it. Research buyers inherited the format, not because it matches research draw patterns, but because it is what distributors carry.
Is a 10 mL vial sterile-tested the same way?
BAC Water Depot's 10 mL vials are USP <71> sterility and USP <85> endotoxin tested per production lot by an independent third-party laboratory, with the lot-specific Certificate of Analysis published and reachable from the QR code on the vial.
Order Direct
Research-Grade Bacteriostatic Water · From $9.99
ISO 9001:2015 USA-manufactured. An independent third-party lab verifies every production lot. CoA available per lot.