1.
gabion sack are double twist hexagonal wire mesh units consisting of a single mesh panel laced to form a cylindrical unit. 
Gabion sack are filled with rock at the project site to form flexible, permeable, monolithic structures used for emergency and river training works, where local conditions require fast installation or the water does not allow easy access to the site (underwater installations).
2.Characteristics:
(1) Economic and useful: What we need to do is just put the stones into the cage without special skills.
(2) It is convenient to transport as it can be transported folded, assembly on site.
(3) It has a strong resistance to natural destruction and poor weather.
(4) It can withstand large-scale deformation, and does not collapse.
(5) Some plants can grow in the gap among the rocks, and it can melt with the natural environment surrounding together.
(6) And it has good permeability, which can prevent the damage caused by fluid static.
3.Uses of Sack Gabions:
Sack Gabions can be widely used in highways, railways, protecting hillside, hillside greening, well and alley fence, building and breeding, zoo fence, greening fence, hillside net cage, flood fighting net cage, revet fence, control and guide the direction of river, spillway and diversion channel, rock fall protection, prevent soil and water from flowing, beach protecting project, protection of the bridge, solid structures defense project, retaining wall, and port project, etc.