Toyota Prius 2011 Manual page 384

3-5. Using the storage features
Removing the cup holder (front type B only)
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CAUTION
Items unsuitable for the cup holder
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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
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Keep the cup holders closed. 
Injuries may result in the event of sudden braking, sudden swerving or an
accident.
384
Pull up.
ITO35P126
Cup holders