Sandbags are a best management practice at many construction sites to mitigate run off into the storm sewers. They can usually be found locally, stop by a neighborhood where homes are being built and ask the superintendent where he gets his. Probably locally, and usually real cheap.
I don't remember seeing any burlap bags in Iraq. Just sayin.
Good thing I'm a "Bunker Bob" then.Burlap bags are best. They are made to be filled, then emptied when it is time to move forward.
For all of the "Doug Out Dugs" who want to hold on to their little piece of ground until they are over run, you better build your fortress with cinder blocks and reinforced concrete.
Wish/wonder if you could buy those Jersey Berriers (think that's what they were called) we had in Iraq, they were awesome sand bags, fill them with a loader. They were like big sand bags and seemed to last a long time.