I like to use a fanny pack. It works well because I can wear it on all the rides, and the one I have holds my wallet, phone, camera, etc.
I just found the Baggillini Messenger bag for $19.30! It was with a promo code on Bagsbuy.com. They have free shipping, no sales tax, and there was a $10.00 off code. Plus you get a discount for registering with them. I hope it's the right bag! I was excited to find such a great deal.
Thanks again to everyone!