There’s nothing worse than parking your bike up in the sunshine and going back to it hours later to find the seat soaking wet after an unexpected downpour. You’re then left having to pedal all the way home out of the saddle to stop yourself getting a soaking wet bum.
This is such a common problem and such an easy to solve one. Stash a couple of carrier bags at the bottom of your bag and whenever you have to leave your bike outside tie one round the saddle to stop it getting wet.