I'll bring carrots, celery, radishes, broccoli, depends on what I can scrounge from the kitchen but I eat all of those raw more often than cooked and they all travel well for a couple days or more when it's cool out.

If I'm going to be doing a lot of hiking and want to go lighter I'll turn more to dried fruit for fiber. Raisins, cranberries, prunes, cherries, etc. and fresh apples are always good.
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