95kPa Specimen Bags: Choosing UN3373 Category B Packaging
A 95kPa bag is not a marketing upgrade — it is the pressure differential a specimen package must survive under Packing Instruction 650, and it applies to the primary receptacle or the secondary packaging, not to the outer box. CliniEco's 6×9-inch, 95 kPa specimen bag in a 100-pack works out to $0.16 per bag ($0.13 in the 10-box case). Premium imported lines sold through laboratory distributors list at $4.90 to $13.40 per bag for larger formats, which is a real difference at lab volume. Here is how to compare them without over-buying or under-specifying.
What UN3373 Category B Packaging Actually Requires
Biological substances in Category B are shipped under the UN3373 marking and the P650 packaging instruction. The system is a three-layer build, and each layer has a job.
| Layer | What it does | What to check before buying |
|---|---|---|
| Primary receptacle | Holds the specimen — tube, cup or vial | Leakproof, correct volume, absorbent material sufficient for the contents |
| Secondary packaging | Contains the primary and absorbs a release; must withstand a 95 kPa pressure differential | The 95 kPa claim in writing, seal type, film thickness, document pocket |
| Rigid outer packaging | Protects against impact and puncture; carries the UN3373 marking and shipper details | Rigid, correctly marked, minimum 100 mm × 100 mm marking per P650 |
The detail buyers get wrong is the word "or". The 95 kPa requirement is met by either the primary receptacle or the secondary packaging — so a lab that uses 95 kPa-rated bags does not need 95 kPa-rated tubes as well. It also means that if you buy an unrated bag, your tubes have to carry the requirement instead. Choose one layer to be the pressure-rated one and document it.
For carriers, the requirement lands at the point of acceptance. Purolator's UN3373 guidance for biological substances states plainly that the package "must meet the criteria of Packing Instruction 650," lists the UN3373 mark, and lists the criteria a shipper has to satisfy. If your courier rejects a package, the cause is almost always the marking or the outer packaging, not the bag.
Which 95kPa specimen bags do Canadian labs use?
Four names come up repeatedly in Canadian laboratory purchasing, plus our own line.
| Brand / line | Format | Where it is sold | Price basis |
|---|---|---|---|
| Therapak 95 kPa transport bags | Multiple sizes, 1-pocket and 2-pocket with document pouch | Laboratory distributors including Fisher Scientific Canada | Distributor list price; larger sizes are the expensive end |
| Marketlab 95 kPa biohazard bags | 11.5×16.6 in and 14.5×20.5 in, 25 or 50 per pack | North American medical resellers | $245.19 to $335.04 per pack — $4.90 to $13.40 per bag |
| CFT Canada 95 kPa bags | 6×9 in (700/case), 9×12 in (300/case), peel-and-seal | Direct from the Quebec-based supplier | Quotation; sold in case and unit quantities |
| ShuttlePac ShuttlePouch 95 kPa | Pouch format, independently certified | UK supplier, used by pathology networks | Quotation; strong on reduced-plastic construction |
| CliniEco Medical specimen bags | 6×9 in, 3 mil, dual zipper, external document pocket, numbered tracking labels | clinieco.ca, direct to clinics and labs | $15.95 per 100-pack ($0.16 per bag); $127.60 per 1,000 ($0.13 per bag) |
The comparison is not a quality-versus-price contest. The Marketlab formats are 11.5×16.6 inches and larger — sized for multi-tube racks and cryoboxes — and a 14.5×20.5-inch bag costs more because it uses more film. What matters is matching the format to what you actually put inside it.
How much should a 95kPa specimen bag cost at lab volume?
A community lab moving 300 specimens a day, six days a week, uses roughly 90,000 bags a year if it bags one specimen per pouch. Per-bag differences are the entire budget at that scale.
| Option | Per bag | Per 1,000 | Per 90,000 |
|---|---|---|---|
| Premium imported 14.5×20.5 in format | $13.40 | $13,402 | $1,206,180 |
| Premium imported 11.5×16.6 in format | $5.59 | $5,591 | $503,190 |
| CliniEco 6×9 in 100-pack | $0.16 | $160 | $14,400 |
| CliniEco 6×9 in 10-box case | $0.13 | $128 | $11,520 |
Those numbers are not a like-for-like oversize comparison — they are a reminder to size the bag to the specimen. Most clinic and community-lab work fits a 6×9-inch pouch with a document pocket. Buy the oversized format where it is genuinely needed, for rack transport or frozen cryoboxes, and price the rest of the volume accordingly.
What should you check before ordering 95kPa specimen bags?
- Size against the primary receptacle, not the rack. A pouch that is too large lets tubes shift and the absorbent pad lose contact with a leak.
- Seal type. Peel-and-seal and dual-zipper closures remove the heat sealer from the workflow. Confirm the closure is tested, not just described as leak-resistant.
- Document pocket. Requisitions travel with the specimen. An external pocket keeps the paper out of the specimen compartment and off the outside of the package.
- Film thickness. Thicker film resists punctures from tube caps and rack hardware. Ask for the gauge in mil; "heavy duty" is not a specification.
- Evidence. Ask for the 95 kPa test documentation for the specific product and size you are buying, and keep it with your packaging procedure.
What handling mistakes cause leaks?
Most leakage that reaches a courier is procedural, not a manufacturing defect. Four habits prevent it: do not exceed the marked fill line on the primary receptacle; keep the absorbent material sufficient for the full contents of the primary; seal the bag on a clean, flat edge rather than over a fold; and mark the outer packaging with the UN3373 diamond, the shipper name, address and telephone number. Nothing about good packaging is expensive — it is a procedure that gets followed.
Documentation matters as much as the bag. The specimen bag guide used by food testing laboratories follows the same logic: one specimen per pouch, the requisition in the outside pocket, and a log that shows which laboratory received what.
Where CliniEco Fits
CliniEco Medical supplies a 6×9-inch, 3 mil, 95 kPa specimen bag with a dual zipper, an external document pocket and numbered tracking labels — $15.95 for 100, or $127.60 for 1,000. It is intended as the secondary, pressure-rated layer for UN3373 Category B transport in clinics, community laboratories and home-care collection routes, and it ships from stock in Canada without a distributor margin added.
If your current bag costs several dollars each and your specimens are tubes rather than racks, that is a purchasing conversation worth having before your next case order.
Labs that also verify their own sterilizer alongside specimen handling can start with the 5-pack biological indicator trial before committing to a case of spore tests.
CliniEco Medical is a licensed medical device establishment (MDEL #35334).
Ordering for a clinic, lab or care home? Wholesale and multi-site ordering covers case pricing and account setup, and the B2B wholesale collection lists the lines stocked for institutional buyers.
Related Reading
- Specimen bag leakage at a community laboratory: a process fix
- Food testing labs in Canada: specimen bag and sampling guide
- Sexual health clinics: specimen bags and exam consumables
- Medical waste bag film testing: dart impact, tear strength and seal integrity
- CliniEco 95kPa specimen bags, 6×9 inch, 100-pack — $15.95
- Waste bags and specimen bag collection
- diagnostic & research lab supplies
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- Sterile Specimen Containers: Leak Testing and Labelling Rules
- Specimen Cold Chain in Canada: Temperature Excursions, Gel Packs and Documentation
- Pediatric Specimen Collection: Urine Bags, Swabs and What Changes for Small Patients
Frequently Asked Questions
What does 95kPa mean on a specimen bag?
It is the pressure differential the package must withstand without leaking under Packing Instruction 650. In practice it means the bag has been tested to hold its seal and integrity when the pressure outside drops by 95 kilopascals, which is the condition the instruction is written around. Ask for the test documentation for the size you buy.
Do I need 95kPa tubes if my bag is 95kPa rated?
No. The requirement is met by the primary receptacle or the secondary packaging, not both. A 95 kPa-rated bag satisfies the pressure requirement, so standard leakproof tubes can be used inside it. What you must not do is use unrated tubes and an unrated bag.
Can a 95kPa specimen bag be shipped in a courier envelope?
No. UN3373 Category B packaging requires a rigid outer packaging that protects the bag in transit and carries the UN3373 marking, the shipper and consignee details and a contact telephone number. A courier envelope is not a rigid outer packaging.
How much should a 95kPa specimen bag cost per bag?
It depends on size and channel. CliniEco's 6×9-inch, 100-pack lists at $15.95, or $0.16 per bag. Oversized imported formats sold through laboratory distributors list at $4.90 to $13.40 per bag, because a 14.5×20.5-inch pouch for rack transport uses far more film. Size the bag to the specimen before comparing prices.
Are CliniEco specimen bags suitable for Category A infectious substances?
No. Category A substances are assigned to UN2814 or UN2900 and require a different, UN-certified packaging system. Our specimen bags are intended for Category B (UN3373) transport and for general clinical specimen handling, and the shipper is responsible for correct classification.
CliniEco Medical is a licensed medical device establishment (MDEL #35334). Competitor formats and price ranges are drawn from supplier listings published in 2026 and are included for comparison only. Shippers remain responsible for classification and for meeting the current transport regulations. Last updated: 11 September 2026.
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