I am working on a new page for my site called "Backpacking Myths and Half-Truths." It will cover things like the idea that coffee dehydrates you (it doesn't), and that alcohol can only cause harm when you're cold (actually, it can prevent frosbite - without causing hypothermia if you will soon be somewhere warm), and that hi-tech socks are best (I stopped getting blisters the day I switched to thin nylon dress socks).
What I need is some suggestions for other myths and half-truths. Thanks in advance to anyone who wants to contribute.