The market on the sale of stainless steel mug variety, price difference is also very large, for some consumers, do not understand its principle, often spent a lot of money can not buy the desirable products.
How can you buy a high quality vacuum flask? First look at the appearance of the Cup.
A look at the internal and external surface polishing is uniform, whether there are touch and scratch defects;
Second look at the mouth of the welding is smooth and consistent, this relationship with a drink when the feeling is comfortable; Third, the quality of plastic parts is poor. Not only affect the service life, but also affect drinking water sanitation;
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