Paracord survival tip - If you have paracord but no other climbing gear, you can still rappel using the traditional body rappel technique,and climb by using the traditional prusik knot climbing setups shown here.
How to tie Paracord knots to your backpacks. Great DIY how to with photos for all the different steps to make the knots. Great for zippers. I have a problem with zippers on my backpack every time I go hiking.