1. Dry Containers
   Dry containers are the most common type of ocean container. They are designed for transporting dry goods such as machinery, textiles, and packaged goods. They are available in 20ft, 40ft, and 45ft lengths and are made of steel with wood or bamboo floors.
    
2. Reefer Containers
   Reefer containers are temperature-controlled containers used for transporting perishable goods such as fruits, vegetables, and pharmaceuticals. They are available in 20ft and 40ft lengths and are equipped with a refrigeration unit that can maintain temperatures as low as -30°C to as high as 30°C.
    
3. Flat Rack Containers
   Flat rack containers are open-sided containers used for transporting oversized or bulky cargo such as machinery, vehicles, and boats. They are available in 20ft and 40ft lengths and can be customized to meet specific cargo requirements.
    
4. Open Top Containers
   Open top containers are similar to dry containers but have a removable top that allows for easy loading and unloading of cargo. They are used for transporting tall or oversized cargo such as machinery, pipes, and equipment. They are available in 20ft and 40ft lengths.
    
5. Tank Containers
   Tank containers are used for transporting liquid or gaseous cargo such as chemicals, oils, and gases. They are available in 20ft and 40ft lengths and are made of steel or aluminum. They are equipped with a tank and can maintain a specific temperature and pressure during transport.
    
6. Ventilated Containers
   Ventilated containers are designed for transporting goods that require a constant flow of air such as coffee, tobacco, and spices. They are available in 20ft and 40ft lengths and are equipped with ventilation systems that allow for proper air circulation.
    
7. Insulated Containers
   Insulated containers are designed for transporting goods that require temperature control such as food and pharmaceuticals. They are available in 20ft and 40ft lengths and are equipped with insulation materials that maintain the desired temperature during transport.

In conclusion, the type of ocean container required depends on the nature of the cargo being transported. Shipping companies offer a range of containers that cater to specific cargo requirements. It is important to choose the right container to ensure the safe and efficient transport of goods.