The highest quality liquid nitrogen dewar flask available, RRP $899. With this you can easily purchase liquid nitrogen from any BOC gases outlet for about $2 a litre. Static hold time for the liquid nitrogen is 70 days per refill, it loses about 100ml per day to evaporation (this is manufacturer rated, it hasn't been tested, though evaporation is not noticeable, so it could last even longer). It also comes with 3 scoop/storage devices for storing sperm/embryo's or other cryogenic projects in the liquid nitrogen. The flask also comes with a padded backpack which fits the flask, the Chinese manufacturer thought of everything!