You can buy these premade...or even cannibalize them off other packs. I've also been able to find a few at various outdoor stores.

If you are looking for a pattern, you can find thoise in a number of places...including the DIY section in this website, I believe. It's not complicated--a sleeve, a little closed cell foam inside, and a bit of webbing on each end should get you going.

Here's a link to one of the patterns on this website:

http://www.backpacking.net/makegear.html



Edited by balzaccom (01/12/10 11:14 AM)
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Or just read a good mystery novel set in the Sierra; https://www.amazon.com/Danger-Falling-Rocks-Paul-Wagner/dp/0984884963