Here's a homemade system on youtube that sucks air out with a shark vacuum and then fills the bag up with nitrogen using rudimentary equipment. Perhaps it's not sustainable (use of plastic bags) but it certainly is practical and far less energy intense than wasting food or using cold storage: http://www.youtube.com/watch?v=pg5rob9sBF8&feature=related
This website is an excellent primer on food storage that includes a list of tools and "baby steps" that guide you to packaging your own food: http://foodstoragemadeeasy.net/
This is a great primer on calculating how much food you'll need in the event of a societal collapse: http://campfire.theoildrum.com/node/4980
Here are some of the most popular off the shelf systems:
http://www.sealameal.com/
http://www.foodsaver.com/Index.aspx
http://www.pump-n-seal.com/
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