The SOS ™ series plastic containers are made of sturdy polyethylene resistant to extreme temperatures. They are also resistant to bacteria, fungi and mold. Several sizes are offered to suit different material storage needs. They are very useful to store sand, salt, chemicals or other products left outdoors. A lock is optional to secure content. Versatile, they can be used inside and can also be used for waste management. They are known to be tough and durable.