A grab-and-go companion for any cyclist.
The Mountainsmith Bide Cube Deluxe is a convenient repository for all of you biking goods.
A few criticisms: The pockets for shoes don't fit mine (size 13) and the helmet pocket fits my XXL Giro without a problem, but if you ride a mountain bike, expect to have less convenient organization. Mine has more than enough storage room for my small amount of road biking gear, but expect to fill it if you are a downhill big-bike rider.
Good for keeping all that stuff from bouncing around the back of the car. Also easily store the essentials at home where they can be grabbed quickly.