A fire resistant safety bag comprising a body that defines an internal volume for carrying and storing a lithium ion battery having a maximum energy capacity between 250-1250 Wh, such as 750 Wh, wherein the body of the bag is formed of multiple layers of fire resistant material designed for resisting the thermal energy contained in a 50% charged 750 Wh Lithium-ion battery, and wherein the layers of fire resistant material are jointly flexible for allowing one end of the bag to be folded between an open and a closed position for reversibly closing off the internal volume against manual access, wherein the bag comprises a high temperature first vent suitable for venting gasses from the inner volume to the environment, said first vent being loaded with a fire resistant material forming a filter.