In accordance with the packaging instructions P650, packaging for UN3373 must consist of at least three components:
- a primary tube
- a secondary tube
- outer packaging.
It is necessary to ensure that the two tubes are impervious to liquids (if liquid substances are being shipped) and one of the two has an internal pressure of 95 kPa (0.95 bar) with no loss of filling material.
An absorbent material which can soak up the entire filling quantity must be inserted between the two tubes.
At least one of the surfaces of the outer packaging must have minimum dimensions of 100 x 100 mm.