This small hole was formed when the manufacturer vacuumized. Good quality will hide small holes well. This thermos cup is only covered with a trademark, and tearing off the trademark will generally not affect the effect. Different manufacturers have different heat preservation time.

Extended data

Proper use of thermos bottles should pay attention to the following points:

First, clean it thoroughly once a day. This is the fundamental way to prevent odor and stains. When cleaning, you must not simply rinse with water. Pay attention to the cup surface, inner container and bottle cap. ?

Second, wash the inner container first, and then wash the bottle cap. Generally speaking, the correct steps are: put a small amount of salt in the bottle, add warm water, shake well and soak for 5~ 10 minutes; Take off the lid of the cup, squeeze some toothpaste on the toothbrush and gently brush the gap of the bottle cap; Rinse the inside and outside of the cup with clean water; Don't cover it immediately after washing, dry it thoroughly before covering it, so as to avoid the stainless steel thermos cup stinking. ?

Third, don't make tea or drink. It is best to use thermos simply for drinking water, and avoid making tea and filling drinks, dairy products or traditional Chinese medicine.

People's network-thermos cup, a health hazard on the lips