The requirement to securely seal all hazmat containers is true.

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Containment and safety require securely sealing hazmat containers. Keeping containers closed prevents leaks, spills, vapor release, and exposure during storage, handling, and transport. Regulations mandate that hazmat containers stay closed and that closures remain secure unless there is a controlled, purpose-specific reason to vent or dispense. This means ensuring caps, lids, and seals are tight and intact, and applying any required tamper-evident seals or securing devices. While there may be approved procedures for venting or dispensing under strict controls, the general rule is to keep all hazmat containers securely sealed to protect people and the environment.