49 CFR §178.1065

1. (a)General. The righting test must be conducted for the qualification of all Flexible Bulk Containers design types designed to be lifted from the top or side.
2. (b)Special preparation for the righting test. Flexible Bulk Container design types must be filled to not less than 95% of their capacity and to their maximum permissible gross mass, the load being evenly distributed.
3. (c)Test method. A sample Flexible Bulk Container design type must be tested; the Flexible Bulk Container should start lying on its side and then must be lifted at a speed of at least 0.1m/s (0.328 ft/s) to an upright position clear of the floor, by no more than half of the lifting devices.
4. (d)Criterion for passing the test. For all Flexible Bulk Container design types there must be no damage that renders the Flexible Bulk Container unsafe for transport or handling.