Okay, Earthbags are a useful item, they are what a lot of the Ecotopic inclined use for the rammed earth walls on their earthships. Mix the clay type dirt, 3/4 inch aggregate, and cement pour it in and give your wall a good soaking... You can also double wall as well with regular mix earthbag on the outside. Stucco over it,do the trim right, and you have a regular looking house until a visitor notices that the exterior walls are 3 feet thick. Look at Earthship references and Rammed earth references from google and youtube.
I have discovered that you can pump concrete grout into soaker hose and the soaker hose breathes enough to let the concrete cure. How much earthbag and garden hose with rebar can you stockpile in a 20-40 foot shipping box? Enough material to make walls for the edge of your property? Use wattle and daub to sandwiched foot thick layer of compacted clay and 3/4 inch aggregate. The inner and outer walls could eaisliy be tied together with rebar precut and bent. make a nice 10-12 foot high wall. Use the earthbags to create a retaining wall against the inside base of the wall to create a sentry walk that can look out from the immediate gulch habitation. You could also do the whole thing ahead of time with the sentry walk being set up for growing ornamental climbing greenery. A little gas and a match could clear that when SHTF happens.
That same wall could be used as a form for the walls of an earth bermed house as well or a hobbit hole style one if you domed it in. a foot thick with rebar every foot and rebar rings resting on the crossties at the right intervals.... I got about 1000 feet free from a landscaper that went out of business. I know that there may be cheaper ways to make things, but it is an idea. If post SHTF in and ongoing grid annihilated situation, and you 'forage' some of this stuff with concrete?
http://www.walmart.com/ip/3-8-x-250-Element-Bulk-Soker-No-Couplings/46723657http://www.mrdrip.com/352-820-OD-58-ID-x-250-Bulk-Soaker-Hose-_p_830.htmlEdit:
Woodlath or lath split from trees could substitute for the hose. Now you only have to find rebar to salvage and weave in.