Common misconception. My backpacking diet (and home diet) has been vegetarian for 41 years and vegan for the last 3 years.
My backpacking food bags contain brown rice and beans along with TVP. Peanut butter is mixed in with oatmeal too. I also make PB sandwiches on whole grain bread and/or rice cakes. I can home-dehydrate a significant amount of beans and rice---and recently made a large Outdoor Herbivore order as some of their meals are outstanding. And will carry a couple lbs of their powdered soy milk on my next trip (mixes great in morning tea with honey).
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Cooked organic brown rice dried and ready to be ziplocked.
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Pinto beans home dried. Mix the two for complete protein.
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Another option---dry canned foods.
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Sometimes the dried hard kernels of brown do not rehydrate too well so I thoroughly blend cooked rice with water and dry in sheets for quick cooking in the field.
On my last trip I augmented my diet with copious wild ramps---
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Ramps with vegan mac and cheese.
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Brown rice with ramps.
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On my trips I always take a goodly amount of olive oil. On my next trip it'll be both olive oil and pumpkin seed oil.
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Nut butters are heavy but offer the best protein/fat combo for me. Here I am on the Deep Creek trail with all my precious nut butters at the start of a trip---PB, cashew, almond butters.