Rain gear

Rain gear. The unwritten rule about whether to take rain gear on a
ride: If you have it, the sun will shine. If you don't have it, it'll
rain! A storm can blow in when you least expect it, especially in high
country. And few things will leave you more miserable than to be
soaked to the skin with miles yet to ride.
Tip: If you don't want to invest in, nor carry, a full-length rain
slicker, tuck an inexpensive plastic poncho--or even a large
heavy-duty leaf bag--in your saddlebag. The latter can be made into
makeshift rain gear, and has many other potential uses as well.