The following IBCs are authorized, provided that the general provisions of 4.1.1, except 4.1.1.15, 4.1.2 and 4.1.3 are met:

Rigid, leakproof IBCs conforming to the packing group II performance level.

Additional provisions:

1 There shall be sufficient absorbent material to absorb the entire amount of liquid present in the IBC.

2 IBCs shall be capable of retaining liquids.

3 IBCs intended to contain sharp objects such as broken glass and needles shall be resistant to puncture.