Concrete Canvas Shelters | The Woodsman Hut | Forums

wonder how much those go for and if you can bury them, instant root cellar

all I can find for prices is this

Aid agency chiefs have been impressed by the simplicity and economy of the idea. A bag weighing 230 kilograms (approximately 500 pounds) inflates into a shelter with 16 square meters (172 square feet) of floor space. Cost is estimated at £1,100 ($2,100), while an equivalent-size Portakabin (a type of portable building widely used in the United Kingdom) costs about £4,000 ($7,700). The same-size tent costs about £600 ($1,150).

but it's from a old article

http://archive.wired.....5/03/66872

wow, I wonder if there is a DIY version

they did, I posted this a couple months ago, I wonder how a bunch of towels over a rebar framework would work

http://thehomesteadi.....h-planter/