Bananas, (not green!), watermelon slices, small servings of trail mix or the like, peanut butter or nutella with graham crackers or whole wheat bread, pretzels, goldfish crackers, sometimes even a few potato chips (for salt), small cookies like fig bars or soft (not crunchy) oatmeal raisin or chocolate chip, cold water and an option for an electrolyte,

I would crave the salty stuff later on. Sometimes a cold coke sounds really refreshing toward the end of the ride

Definitely not: granola bars

Some rides I've been on seem to try to be saving money on the sag stops and go for cheap, bulk packages of stuff that just isn't appealing and may not have really good ingredients (like a lot of corn syrup etc). The last ride I was on (66 miles) was $50 for the entry and there were two stops with water, bananas that were mostly not ripe, and some discount granola bars. I took the water and bananas, but skipped the granola bars- not interested in those at all!