Two one-litre Thermos flasks (Elmstead BR7)

These are proper old-fashioned Thermos brand vacuum flasks with silvered glass vacuum interiors that actually do keep the contents hot or cold. They have screw-on plastic stoppers and a smaller inner cup in addition to the outer cup with handle. I've long followed my Auntie's tip to always store Thermos flasks open so that they keep fresh smelling inside, and with a loosely crumpled plug of kitchen paper in place of the stopper to keep any dust out. It really works!