The terms are often used interchangeably, but there are practical distinctions. A dewar (named after James Dewar) is any vacuum-insulated vessel designed to store cryogenic liquids this includes everything from small bench-top containers to large laboratory tanks. A cryogenic tank in laboratory contexts typically refers to larger, fixed or semi-fixed storage vessels used for bulk sample storage. In IVF, both terms refer to the same category of equipment. At Cryolab, we supply CryoCan dewars for small-scale and portable use, CryoNest tanks for high-capacity IVF clinic storage, and CryoStork dry shippers for transport.