My product is a thermosteel bottle which allows the internal temperature of the bottle to be kept constant. This bottle can keep substances within it at very hot or very cold temperatures for many hours. There are many factors that go into making this bottle work such as its design and the engineering behind it. There are different criterias that I will be using to determine if my product is in good quality which include portability, safety, and insulation. 

My product is a thermosteel bottle by the brand Milton. The bottle is silver in color, but is made entirely from stainless steel. This bottle uses a plain lid design which means that there are two twistable lids for the bottle that help to keep liquid and heat from escaping the flask. This flask is shaped like a cylinder and has a lid with a round shape at the top. The bottle is able to hold up to 12 ounces and can keep water hot or cold for up to 24 hours.

This bottle is able to keep things at a certain temperature because of the use of insulation. There is a double walled container in the flask that is made of steel. Between these walls there is a vacuum, which prevents heat from escaping the flask. The bottle is made of 100% stainless steel which is rust free and also has strong corrosion resistance from the vacuum between its walls. There is also a copper coating on the inside which allows better heat retention for the bottle.  

The concept of a vacuum flask was originally invented in 1892 was used for keeping certain chemicals at a stable temperature. However, the product nowadays serves a different function, which is usually used to keep a variety of liquids and drinks such as milk, water, and juice at the right temperature. 

The first criteria I will be using to evaluate the quality of my product is portability. For this bottle to be considered portable it should be easy to carry around and take places. The factors that would allow my product to be portable include weight, size, and temperature. My product is easy to move around and easy to grip as it can be held with a single hand. The outer side is not the same as the temperature inside so you can touch the flask without getting burnt or cold. 

Another criteria that would determine the quality of my product would be its safety. This means that the flask, when closed, will not leak or allow anything inside to escape. To meet this criteria, the thermosteel bottle would have to be designed so that it stays shut and secure, preventing any substance from escaping. My bottle has two lids that can close correctly and are not loose and prevents heat or liquids from escaping when closed. 

Insulation is another criteria to help me to see the quality of this thermosteel bottle. This criteria is if the inside temperature is kept in the bottle. The product should be able to keep hot drinks hot and cool drinks cool for some time. My product keeps things hot or cold for up to 24 hours. It can even be used to temporarily prevent milk from going bad and keep ice from melting for some time. 

An alternate use of this product can be packing certain kinds of foods such as soups, sauces, eggs and even meats. I personally use this thermo bottle when I want to keep a drink hot or cool on the go. This thermo steel bottle is a great way to keep food and drinks at the right temperature. It is easy to bring around, safe and secure and an overall good option for savoring food and drink to have for an extended amount of time.