Great question — answering as the UphillTech team:
Here is the list of stuff I would consider taking on longer hikes: trail mix chocolate muesli bars more expensive energy bars are great for really demanding stuff, where energy to weight ratio really counts (e.g. multi pitch climbing). They are also more filling than muesli bars. beef jerky dried sausage vacuum-packed hard cheese peanut butter or nutella canned tuna or tuna salad bread (or alternatives such as crackers, pita, tortillas) powdered milk olive oil (high calorie content, can be eaten with bread italian-style) all kinds of sweets Those items also do a good job, but only work for short (one-two day) hikes because of spoiling or weight concerns: bananas, grapes and other fruits...
Full answer by Klara: https://outdoors.stackexchange.com/a/10778 (CC BY-SA 3.0).
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