Capacity is the only thing two such quotations have in common, and it is the specification that matters least.
What Is Inside the Wall
Better vessels carry more layers of multilayer insulation, cleaner internal materials that outgas less, and a larger getter, the chemically active component that absorbs stray gas molecules and holds the annulus evacuated. Getter capacity is a direct determinant of service life. None of it is visible on delivery, and all of it reappears as evaporation rate and as how many years the vessel holds performance.
Build Quality Shows Up as a Failure
Neck construction, internal support design and weld quality decide whether a vessel survives being caught by a trolley. A shock can crack a weld or fracture an internal support with no external evidence, and the vacuum degrades quietly from there.
A vessel specified for a store room it never leaves is a different build from one moved weekly, and the cheaper quotation is often the former sold as the latter. The difference surfaces eighteen months later as rising consumption. Ranges and specifications are listed under storage vessels, with the cost drivers in liquid nitrogen container price.
