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Check the sealing
General lunch boxes should be sealed in plastic packaging bags, and the packaging bags should not be damaged. The loosely packed lunch boxes are vulnerable to environmental pollution, and their hygiene cannot be guaranteed.
Look at the outer package
Check carefully whether the package label is marked with "product name, manufacturer name, factory address, product implementation standard, production date, shelf life, hygiene license" and other contents that must be marked according to national regulations. If the label contents are incomplete or non-standard, such lunch boxes should not be purchased.
Look at the box
The body of a good quality lunch box should be uniform in color and clear in outline, and the mouth of the box should not have obvious dents or wrinkles.
Look at the box mouth
Note that the opening of the box is flat and smooth, without waste edges and burrs. The cup body should be clean and transparent, with uniform thickness, without impurities, bubbles, water marks, fish eye stiffness, etc.
A squeeze
Choose a lunch box with good hardness, and try to choose a lunch box with thick and firm wall. When choosing a lunch box, gently squeeze it on both sides of the box with your hands to roughly know whether the hardness of the box is good or bad.