Biological products exceeding 4 liters or 4 kg containing Category A
For Biological products exceeding 4 liters or 4 kg containing Category A, carrier is USPS; restriction type is prohibited; scope is all mail; conditions is Biological products, cultures, or specimens known or suspected to contain Category A infectious substance, or exceeding 4 liters/4 kg limits, are nonmailable, recorded from its source on 2026-08-04.
- Item category
- Biological products exceeding 4 liters or 4 kg containing Category A
- Carrier
- USPS our reading
- Restriction type
- prohibited our reading
- Scope
- all mail our reading
- Conditions
- Biological products, cultures, or specimens known or suspected to contain Category A infectious substance, or exceeding 4 liters/4 kg limits, are nonmailable
Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.
What the source says
Biological Products and Specimens: Biological products, cultures, stocks, or other biological specimens known or suspected to contain a Category A infectious substance. Mailpieces exceeding 4 liters (1 gallon) for liquids or 4 kg. (8.8 pounds) for solids are nonmailable.
— pe.usps.com, retrieved 2026-08-04
Source
- pe.usps.comhttps://pe.usps.com/text/pub52/pub52c3_025.htm