Open Question: What foods to bring on a three day camping trip?

I won't have a cooker and cooler. I was thinking about mainly tinned food but I'm really tight on space in my bag.
It has to be ready to eat at any time and nutritious to keep me going all day.

Thanks

Source:
http://answers.yahoo.com/question/index?qid=20110713131731AA7jvxm

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