Rock Bags

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Environment, Innovation and Flexibility.

Rock Bags, made by Kyowa, are innovative flexible mesh nets for use around bridges, roads, railways, shorelines and rivers to protect and manage erosion.  Kyowa Rock Bags explainedWhen filled with rock or riprap, the rockbag is a flexible protection system.

The Rock Bags are a sustainable environmental civil engineering alternative solution to gabions, large rock, blockstone, free rip rap and rock mattresses.

Some of their main advantages are that they do not require foundations or ground / bed preparation, this also means the Rock Bags are a practical solution when installation involves uneven or sloping surfaces.   The Rock Bags can simply be used to contain the riprap and provide a faster and more accurate means to deploy it.  The Rock Bags offer a rapid fill and rapid deployment system that support economical and environmental civil projects.

Rock Bags are proven to protect and be used for:

These Rock Bags prevent water damage of the protected surface without destroying the environment.

The Rock Bags reduce water flow velocity as water energy is absorbed into the space between the rocks.  When installed under water, the spaces between the rocks provide a habitat for plant life and become an adopted home for fish and other aquatic life.

Moeover, they can be covered with soil to support plant regeneration to  further protect the at risk environment.

Lifespan & History of the Rock Bags

Rock Bags have a proven lifespan of over 35 years and have a lifespan of 50+ when covered, either by water or  soil / vegetation.

Recently, civil engineering teams have been applying Rock Bags to protect marine cables and subsea pipelines in an environmentally friendly way.

Rock Bags were used for the first time in 1987 to protect the foundations for the great bridge at Akashi, the world’s longest span bridge with a total length of 3,911 metres.

The Rock Bag has found wide application in civil engineering for rivers and coastal works for more than 35 years. Over 24,000 projects with more than 1,300,000 Rock Bags installed.

Are you working on a project that requires erosion remediation and prevention work? Then get in touch with Bluemont today by filling in our contact form. You can also call: +61 2 9091 0360 or email: We will gladly assist you.

Main Advantages of Rock Bags



Adapts perfectly to all soils for highly efficient coverage and absorption of energy.



Supports natural vegetation and encourages the development fauna and flora.

Installation of rock bags


Due to the speed of deployment and reduction in labour costs as the products are highly flexible.

Rock Bags