US 
Code 760
Category B UN3373 Biological Substances – Postal Pack
Internal Dimensions: 7.48in x 4.52in x 1.02in
Specimen Packaging Options for Category B Biological Samples
Our specimen packaging range is suitable for containing Biological Substance, Category B (UN3373) during transportation in accordance with IATA, DOT and IMDG Dangerous Goods Regulations. Materials classified as Category B can range from blood samples to swabs or tissue samples.
We offer the following packaging options for specimen shipping:
Postal Pack
Includes outer box, pre-printed UN3373 label, 95kPa BioBag-751, absorbent cushioning pouch, tamper-evident seal and a pre-printed QR code providing direct access to assembly instructions.
Bioshipper Kits
- Bioshipper-1 our mid size kit includes outer box, a BioBag-751, absorbent cushioning pouch, tamper-evident seal, a pre-printed UN3373 label and QR code providing direct access to assembly instructions. It is capable of carrying up to 4 x BioBag-751s.
- Bioshipper-2 is our larger kit that supports our largest BioBag-752, which can accommodate cryovial boxes or multiple single primary receptacles. Kit includes outer box, BioBag-752, 2x absorbent cushioning pouch, a tamper-evident seal, a pre-printed UN3373 label and QR code providing direct access to assembly instructions.
Biotransporter Temperature Control Packaging
- Biotransporter 1: Temperature-controlled infectious substance packaging. Corrugated plastic outer case with EPE polystyrene foam liner insulation; designed for up to 5 kg dry ice (30–40 h thermal protection) and suitable for both Category A and Category B substances when used with appropriate secondary packaging such as Biotubes 330. Dry ice shipments are prepared in accordance with UN1845 requirements under IATA and DOT regulations.
- Biotransporter 2: Temperature-controlled packaging. White plastic outer case with EPE polystyrene foam liner; holds a 1.5 L Biojar, up to 7 kg dry ice, and provides up to 130 h insulation. It is suitable for both Category A and Category B substances and supplied as a complete combination packaging, including 1 x 1.5 L Biojar (Code 490). Dry ice is handled in accordance with UN1845 and applicable DOT requirements.
Thermal Control Units
- TC-100: Large capacity thermal control over-pack.
- TC-565: Compact unit; maintains ≤ –20 °C with dry ice.
- TC-650: Mid-size unit; carries approximately 4 kg dry ice and maintains ≤ –20 °C.
Specimen Bags
- BioBag-751 (95 kPa specimen bag): Engineered to withstand 95 kPa pressure differentials and suitable for primary receptacles containing Category B specimens.
- BioBag-752 (95 kPa specimen bag): Larger format specimen bag engineered to withstand 95 kPa, capable of carrying cryovial boxes or multiple individual primary containers.
Main Benefits of Our Specimen Shipping Boxes
- Approved for Biological Substance, Category B (UN3373) and compliant with Packing Instruction 650 as defined within IATA, DOT and IMDG Dangerous Goods Regulations.
- Secure and durable packaging designed to withstand drops, handling during shipping, and changes in air pressure.
- A wide range of sizes available, from postal packs suitable for mailbox delivery to larger solutions for cryogenic samples.
- Thermal control packaging provides chilled or frozen temperature solutions during transport.
- Versatile packaging suitable for transporting a wide range of UN3373 applications, including veterinary, medical, and laboratory specimens.
When to Use Specimen Shipping Boxes
Our packaging is suitable for shipping UN3373 specimens such as:
- Blood and plasma samples
- Swabs, including COVID-19 and viral diagnostic samples
- Tissue, fluid, or urine samples
- Veterinary specimens and diagnostic materials
Why Choose Air Sea Containers for Specimen Packaging?
We have been operating in the industry for over 40 years, providing proven expertise that laboratories, healthcare providers, and logistics professionals can rely on.
Our team can provide the support needed to help ensure your requirements are met. Combined with our extensive range of UN approved packaging, we deliver reliable solutions designed to support compliance with Dangerous Goods regulations in the United States and internationally.
Specimen Shipping Boxes – FAQs
UN3373 is a UN number assigned to Biological Substance, Category B. Substances covered include blood, tissue, swabs, urine, stools, and other diagnostic samples that may be infectious but do not pose a threat of life-threatening or permanently disabling disease. In the United States, UN3373 shipments are regulated by the Department of Transportation. Materials presenting a higher risk are classified as Category A under UN2814 (Infectious substance, affecting humans) or UN2900 (Infectious substance, affecting animals).
Yes. UN3373 Category B materials must be shipped using triple packaging, consisting of a primary receptacle, secondary packaging, and a rigid outer packaging, in accordance with Packing Instruction 650 as defined within IATA, DOT and IMDG Dangerous Goods Regulations.
