Jo it depends on what you are choosing to eat as well. Daz mentioned the shot blox - clif ones. They are excellent, really easy to both eat and more importantly get out of the packet!! Banana's are an obvious choice too if you like them? Easy to peel etc although do tend to go manky in the back pocket with the heat. The sportifs are generally well laid out and the checkpoints just when you need them and more often than not very well stocked. Which one are you doing?