A general-purpose container is also known as a "dry container". These shipping containers are fully enclosed, protected from the elements and weatherproof, with a rigid roof, sidewalls and floor. Dry containers are by far the most common type of container, and as such are used to load most types of normal cargo. In addition, general-purpose containers can have adaptations such as liner bags or flexi-tanks for shipping certain types of liquid bulk cargo or dry bulk cargo.