Like several others above I use the flask and Hammer Gel. When you buy the 26oz bulk gel you can get a pretty decent price compared to the individual packets. I like it because there is no mess (as long as you close the flask before putting it in your jersey pocket) and with a little practice you can take a shot at any time. Riding by yourself you can always stop to eat, drink, take pictures, take a break. But when you are riding with a group it is good to be able to eat and drink on the move. Or else you are soon riding by yourself .

Mark