Toyota PRIUS Manual page 435

CAUTION
 Items unsuitable for the cup holder
Do not place anything other than cups or aluminum cans in the cup holders.
Other items may be thrown out of the holders in the event of sudden braking,
sudden swerving or an accident and cause injury. If possible, cover hot
drinks to prevent burns.
 When not in use
Keep the cup holders closed.
Injuries may result in the event of sudden braking, sudden swerving or an
accident.
PRIUS PHV_OM_OM47831E_(EE)
3-4. Using the storage features
Cup holders
435
3