I know many of you do this but it is not considered safe by the USDA. Freezing is the best method for storing bread. My one venture into this arena was a complete failure. I canned a bunch of chocolate brownie cakes in October, by late December they were fuzzy. Here is the link if any are interested:

http://www.uga.edu/nchfp/publications/u ... breads.pdf

Canning  Breads and Cakes ?
COOPERATIVE EXTENSION SERVICE " THE UNIVERSITY OF GEORGIA
College of Family and Consumer Sciences
and the College of Agricultural and Environmental Sciences Cooperating
Canned  breads and cakes in glass jars surfaces are popular gift-giving ideas.
The bread or cake is not really home-canned. It is baked in an open glass canning jar
and then covered with a canning lid; there is no further canning process given to the
product.
Canned  breads and cakes are not recommended for home cooks or canning;
choose cake or bread recipes that you can freeze. Many cake and quick bread recipes
contain very little or no acid and thus have the potential for supporting the growth of
hazardous bacteria, such as Clostridium botulinum, if they are present inside the
closed jar. C. botulinum causes an often fatal foodborne illness, called botulism. Given
that many of these bread and cake recipes have been shown to be low in acid, the
major barriers to prevent microbial growth are limited to: (1) the dryness of the product
and (2) the lack of oxygen inside the closed jar (because of vacuum seals). Recipe
variations such as the addition of fruit, zucchini, liquids, etc. all contribute to available
water for microorganisms to use. In addition, lack of oxygen alone does not prevent the
growth of all harmful bacteria. The vacuum seals do not remove all oxygen, so some
would still be available to the bacteria which do need it.
Research at Kansas State University, reported in the Journal of Food Protection
in October 1994, showed that heat-stable microorganisms can survive the baking
process and multiply in the breads during storage. Using their own banana-nut bread
recipe, the researchers at Kansas State University baked the bread in glass jars and
sealed them following methods consumers are typically using. A heat resistant
microorganism that is often used in tests to determine when a canning process is
adequate to produce a safe product was added to the batter for some of the jars. In the
breads that had the test microorganism added, it survived all baking and storage
treatments. Vacuums in the jars (an indication of oxygen removal from the headspace)
were good, but apparently not good enough to be the only control; microbial growth still
occurred since enough moisture was available. Underbaking was found to be another
serious problem. The Kansas State researchers also looked at a range of baking times
that still produced acceptable bread to taste panelists. Those breads baked at the
shorter times even showed that microorganisms that were naturally present could
survive in the baked breads.
Research at other universities with commonly available recipes for consumers
has shown the same potential for dangerous products to result. Nevertheless, recipes
for home-canned  breads and cakes do continue to be available. They appear
occasionally in major newspapers, in books, on television and on the web. Availability
Elizabeth L. Andress, Ph.D., and Judy A. Harrison, Ph.D., Extension Foods Specialists.
The University of Georgia and Ft. Valley State University, the U.S. Department of Agriculture and counties of the state
cooperating. The Cooperative Extension Service offers educational programs, assistance and materials to all people without
regard to race, color, national origin, age, sex or disability.
An equal opportunity employer/affirmative action organization committed to a diverse workforce.
Issued in furtherance of Cooperative Extension work, Acts of May 8 and June 30, 1914, The University of Georgia College of
Agricultural and Environmental Sciences and the U.S. Department of Agriculture cooperating.
Gale A. Buchanan, Dean and Director
FDNS-E-75 04-00
is not a guarantee that the finished product is safe, however. Recipes also appear in
some older canning jar company booklets. However, canning jar manufacturers do not
currently endorse baking in their canning jars. They would not be liable for any damage
or illness that occurs from a non-recommended use of their jars.
Breads and cakes in sealed glass canning jars can often be found for sale at
fairs and craft shows. This should not be taken to mean that the consumer can
duplicate the product at home safely. When breads and cakes in jars are made for sale
commercially by reputable companies, additives, preservatives and processing controls
not available for home recipes are used. Safety tests would have been conducted for
each specific recipe for commercial products. It is possible that homemade products
may also appear for sale. Do not purchase canned  breads and cakes in glass jars
unless they contain additives to prevent microbial growth and meet all labeling
requirements for commercial foods.
Given that no reliable, safe recipes for baking and sealing cakes or breads in jars
for room temperature storage are available to the home cook, it is best to say these
products are not recommended at this time.
References:
Aramou ni, F.M., Kone, K.K., Craig, J.A. and Fung, D.Y.C. (1994). Growth of Clostridium sporogenes PA
3679 in Home-Style Canned Quick Breads. Jn. of Food Protection 57(10):882-886.
Harrold, J . (199 9). M anager, C onsumer Af fairs & Fu lfillme nt, Alltr ista C onsumer Products Company.
Pers onal com munica tion. F ebru ary.
Hillers, V.N . (1995). E xtension Food S pecialist, W ashingto n State U niversity. Em ail communication.
January.
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Canning cakes, bread and butter are all considered unsafe. Many do it and are happy with the results, but i don't. I spend my time, effort and money on items that are sure things using tried and true methods. JMO and not meant as a critisism of those who have had positive results.

I read about it in backwoods magazine, but have not tried it as it would take less than an hour to do it anyway.

I tried canning brownies with nuts a few years ago and after canning, they got lost in the shuffle of the storage black hole of our place...doesn't happen often, but found them about 6 months later and they were just as good as could be. No fuzzies, no off odor's, so I was pleasently pleased with that attempt. I only tried 6 half pints and they were gone in a flash and haven't made anymore since, but I was wayyy up in the mtns at the time, so maybe that had something to do with it, who knows? Gonna try it again here at 1800 ft rather than 8000 and see what happens.

I have cannned breads before..as long as they are not the yeast raising type..I usually do up a banana or some type of fruit(whatever is available at the time)..watch for shelf lifes and if properly done will make a great snack when SHTF...even if you only do up a dozen at a time..pre-packed foods come SHTF will be non-existant and doing some breads this way will ensure a healthy filling snack