Static load testing is an essential part of many engineering, building and manufacturing businesses – and the shipping, marine and offshore industry is no exception. Water filled weights (also known as ballast bags) provide a flexible method for load testing. Test weights must be sufficiently heavy to ascertain the maximum load of an object, but they should also be reusable and safe to deploy in a test environment. Where there is easy access to a plentiful supply of water, water-filled weights can provide a quick, efficient means to undertake such testing.