What I'm Packing

The day is almost here!  I've made my list of what I'm packing.  It's not alot.  Just the bare necessities.

I figure that I will be biking for 3.5 or 4 hours so, I will end up getting hungry. But, I don't want to stop to eat so I'm packing a protein bar.  

Lots of water.  

Lip balm.  I have a feeling that I will need it

My Polar V800 watch and Heart Rate Monitor.  I'm really interested to see all my stats.

Have you ever done a long bike ride?  Tell me below what you packed to take with you.  Am I missing anything?