I come across these building bag son the net called Earth Bags. They can be filled with local materials they are fast and cheap to make and more importantly they are sturdy and long lasting.

Some of the advantages

1 - Earthquake proof
2 - Flood proof
3 - Hurricane proof
4 - Vermin proof
5 - Fire Proof
6 - Easy to transport as they can be made on or near the building site
7 - Cheap
8 - They can be filled with loads of different materials depending on your insulation requirements
9 - Stacked to make any shape and don;t require cutting or steel re-enforcement


1 - Need to be covered with plaster or another material to protect them from water and UV rays.
2 - Might be hard to get the building approved