The following IBCs are authorized, provided 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 requirements
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.