I rent a small 2 seater airplane. On long cross countries where the wind causes problems, it is not uncommon for the fuel to last longer than the bladder. Our

I rent a small 2 seater airplane. On long cross countries where the wind causes problems, it is not uncommon for the fuel to last longer than the bladder. Our rental shop had to put out a similar message - if you used a pee bottle, don't leave it in the plane. Most of the time you find that 'half drunk bottle of yellow Gatorade'.... it was not.