"Breathing bag" is the guarantee of "safety" of sterile products, generally used for sterilization and transfer of rubber stoppers for sterile products, and the transfer of sterile area supplies, equipment spare parts, sterile clothing and other sterile area supplies.

Article 62 of the new GMP clearly requires: "Materials, containers, equipment and any other items required for aseptic operation shall be sterilized". Direct contact with the packaging materials of drugs, the assembly of utensils after sterilization needs to be carried out under the A zone, in fact, usually designed from the sterile kettle to the middle of the filling line will have a B area of the transfer, storage process, in order to avoid secondary pollution after sterilization, need to be transported and stored in a closed state, "breathing bag" is the best barrier to be transported and stored items.