Toyota 2009 Tundra Owner's Manual page 439

Removing the cup holder (separated type seats 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 an accident or
sudden braking and cause injury. If possible, cover hot drinks to prevent
burns.
3-6. Using the storage features
Push the tab down to release the lock
and remove the lid.
Stow the lid.
Pull the cup holder up and remove it.
Front cup holders
415
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