I use a stainless steel mesh Ratsack brand sack. I think they are now out of business.

Another alternative is:

http://www.packerlandglass.com/foodsack.html

Yes, it is very important to store food in a rodent and raven proof container when you camp in the sites with habituated animals. Even the stainless steel needs to be hung for ravens.

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"In theory, theory and practice are the same. In practice, they are not."
Yogi Berra