Eveyone needs to drink water right? Its a matter of choice if we like it hot or cold, now there are many cheap insulation thermos out there that promise you protection of the temperature for around 8 hours but failed miserably, why? Its because they use cheap materials to keep it cheap in return you also suffer for the quality of their built.
How about affordable yet great quality, would you buy that? Im proud to say that the Mijia Insulated Vacuum Flask is a good built product without really hurting your pocket. This is made of stainless grade 316 which is the purest form of stainless steel in the market, as well as the multi layered insulation, this will keep your content warm or cold for around 6 to 12 hours depending on the temperature of the content, you can check the reference below.
Now who says that quality has to be expensive?