This series products are the best choices for the customers who keep biological samples or liquid nitrogen in storage for a long period under static environment, featuring long holding time of liquid nitrogen and being economical in usage. This series of products have the following characters: High-strength aluminum alloy structure, light emptied weight The lock device can be installed to the container lid upon users requirement More than 5 years of vacuum quality promise is ensured with the multi-layer thermal isolation design The products are accessory with protective cover, which enhances the protection from reel and stumble