Rust and corrosion resistant blue metal cased economy Dewar Flasks from Scilogex®. Constructed of double-walled silvered boroscilicate glass. The vacuum pump insures efficient storage, transport and use of liquid nitrogen and dry-ice. Equipped with a lid vent to safely vent off evaporating gas. Dewar Flasks are safe for use with all liquid gases and dry-ice and are available in 4 sizes.