''They must open from the top'' is the exception of the requirement for container for hazardous material
<h3>Following are requirements for containers for hazardous material:</h3>
1. They must be leak and puncture proof.
2. They can only be used by people after proper training.
3. They must have biohazard symbol clearly displayed on it.
In conclusion, the container of hazardous materials should be tightly closed from the top.
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