Whose responsibility is it that the coach passenger bag falls off the shelf and hits others?

Article 290 The carrier shall safely transport passengers and goods to the agreed place within the agreed period or within a reasonable period.

Article 302 The carrier shall be liable for damages for the passenger's death or injury during the transportation, except that the death or injury is caused by the passenger's own health or the carrier proves that the death or injury is caused by the passenger's intentional or gross negligence.

Tort liability law

Article 3 1 If damage is caused by emergency avoidance, the person who caused the dangerous situation shall bear the responsibility. If the danger is caused by natural reasons, the emergency evader shall not bear the responsibility or give appropriate compensation. If the measures taken for emergency hedging are improper or exceed the necessary limits, causing undue damage, the emergency hedging person shall bear corresponding responsibilities.