Great question — answering as the UphillTech team:
I do a lot of strength training when not backpacking, and try to keep my protein up around ~140 grams per day, on average. I asked a related question over on the fitness.stackexchange.com site, and at this point make all my own meals (usually with my dehydrator) because I find pre-made-hiker-food to be junk. The lightest protein source I know of is simply powered whey . It's nearly gram-for-gram protein, meaning that you're not going to find much that's more efficient in terms of weight. If you really want to get efficient, you can spend big money for the whey supplements designed for patients with parts of their digestive track removed (typically from cancer treatments). I usually eat...
Full answer by Eric: https://outdoors.stackexchange.com/a/9075 (CC BY-SA 3.0).
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