Four things you notice by the end of week one
We test every production batch in a 40°C heat chamber, so the numbers below are measured rather than estimated.
Cold for 24 hours
750 ml of water at fridge temperature, all day, including in a hot car.
Hot for 12 hours
Tea poured at 7am is still hot at 7pm, with none of the flask aftertaste.
Seals on a quarter turn
A moulded silicone gasket does the work, so it survives a full bag upside down.
Dishwasher safe, lid and all
Body and lid both go on the top rack. No hand-washing, no lingering smell.