Cozyna insulated stainless steel bottle (referred to as a mug in the title) has a insulated stainless steel body and a plastic cap. The plastic cap is not a sports cap, but a spout opening which I find easy to drink from (see video). The cap forms a good seal and is leak proof.
This is a thermos bottle. Its construction is two stainless steel walls with a vacuum between them. This construction is similar to the old glass Thermos bottles with steel replacing the glass. The thermal conductivity of glass is lower than steel so the glass thermos keeps the temperature better, but stainless steel is unbreakable.
To answer the question how well Cozyna thermos keeps the temperature I filled it with hot water, and measured the temperature several times over 14 hours with a temperature probe.
★ start ~~~~~~~~~~~~~~~~ 187 degrees
★ 2 h 35 mins later ~~~~ 158 degrees
★ 6 h later ~~~~~~~~~~~~ 136 degrees
★ 14.5 hours later ~~~~~ 106 degrees
Cozyna thermos holds the temperature well, on par with my favorite old thermos.
The bottle holds 16 oz of water. The bottle's base is 2.25" across at the base. This bottle fits into the bottle holder of my car. The bottle is 9.5" tall (from the base to the top of the cap).
The instructions say that this bottle should NOT be washed in the dishwasher.
You can find it on Amazon by following this link.
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