To bad there wasn't a way to return the bags back to where you bought them, and have them returned to the factory to be refilled. I wish all packaging was made to be returned like the soda bottles used to be. I like the idea of making products that are designed to last. Even packaging.
The Honey house is an amazing structure for sure. With proper drainage, a good foundation and overhanging roof, a sandbag building could last for centuries. The igloo design might not be the best for areas with lots of rain, but why not build a more conventional roof out of lumber and you...
Here is the ultimate use for used Layena bags. You could build a bomb resistant, fire proof, bug proof chicken coop or even a house for yourself and family. Check this out, this house was built by some friends of mine. http://www.earthbagbuilding.com/articles/honeyhouse.htm