The same insulated food jar, in color. Pack soup at 7 a.m. and it is still hot at lunch: 14 hours hot, 19 hours cold, with no preheating and no microwave anywhere in the story.

• Two walls of 18/8 stainless steel with a vacuum between them. Heat cannot cross a vacuum, so the food keeps its own temperature instead of the room's.
• Uncoated inside: no plastic liner, no BPA, no taste carried over from yesterday's curry.
• The outer lid is plastic, on purpose: it has to grip when your hands are cold and survive being dropped. Everything your food touches is steel.
• The anti-vacuum plug stops a jar packed hot from sealing itself shut as it cools, the detail people appreciate three months in.
• Leak-proof screw cap with a silicone seal; it travels lying down.
• Dishwasher safe: jar, lid and seal. A spare seal, a spork, a brush and a cotton bag are in the box.

3-year warranty, and lid, seal, stopper, spork and brush are each available separately under food jar spare parts. A worn seal costs a few dollars instead of a new jar.