One-handed cycling only adds to the many dangers on the road, especially with the potential of getting a hot soaker on the hand carrying a fresh coffee. Enter the bicycle cup holder by Bookman, the solution for morning coffees and beers during Critical Mass.
Open the spring by pressing the rings together, attach it to the handlebar and let go. The cup holder clamps down on the handlebars and sits firmly in place never losing grip even during rides over bumps and potholes. Then, unclamp the bicycle cup holder and take it with you when you lock up your bike.