There are plenty of commuter mugs that are insulated to keep coffee and tea hot, but there are few options for making home iced coffee from a fresh-brewed pot. The Zoku takes a hot 11 ounces of coffee and quickly chills it within the mug for a cold cup. Available for $30.
Pre-chill the mug by leaving it in the freezer until you need to use it. Pour in a hot fresh-brewed pot, and the lining outside the stainless steel interior efficiently transfers the cold it stored up in the freezer to the hot beverage. If you’ve ever poured hot coffee over ice to try and achieve a similar effect, you can understand the value of avoiding dilution in the process.
The interior is BPA-free, so hot liquid won’t release any toxic chemicals. It’s not dishwasher safe, so it requires hand-washing. It comes with an acrylic straw to mimic the feeling of a store-bought cold-brew.
Zoku claims its insulation can cool the liquid down to iced temperature in less than five minutes. Compared to cold-brewing your own batch, or just waiting for a hot mug to cool down, the convenience provided by a purpose-engineered liner is worth the $30 price.