mdunker
Ten Pointer
I bought one of these that Amazon has had on sale. I was skeptical but tried it yesterday. It kept hot chocolate piping hot for over 8 hours. It has kept water ice cold for nearly a day. I am impressed. This one is 17 ounces. I actually bought the 25 oz one.
https://www.amazon.com/Thermo-Tank-..._m=ATVPDKIKX0DER&pf_rd_r=JMEVV2RHT58PZ85D2Z5T
https://www.amazon.com/Thermo-Tank-..._m=ATVPDKIKX0DER&pf_rd_r=JMEVV2RHT58PZ85D2Z5T