Today, an increasing number of therapeutics and vaccines for human and animal administration require shipment in specialized shipping containers often referred to as dewars or cryoshippers. Dewars are composed of an aircraft-grade aluminum exterior that protects an inner holding chamber. The inner chamber is surrounded by a high-surface, low-density open cell plastic foam that retains -196 Celsius for up to 10 days to provide the right conditions for temperature-sensitive materials during transport. Because dewars combine advanced packaging, cryogenics and high-vacuum technology, they can be rather expensive to purchase and maintain. Since they are more expensive than a typical shipping container, such as a Styrofoam or cardboard box, dewars need to be returned for cleaning, reconditioning, testing, revalidation and reuse after each shipment. For companies with large dewar fleets, ranging from hundreds to thousands, ensuring that the dewars are returned can be an especially daunting challenge.