1, used for inquiry: In fact, one of the main functions of this serial number is to facilitate buyers to inquire about the authenticity and source of packages. Buyers can check these serial numbers to know whether this package is real or not. Generally, fakes do not have serial numbers, or serial numbers do not support query.

2. Anti-counterfeiting mark: This serial number is generally installed at the inner seam of the package, which is not clear and is perceived by the user, but it can be clearly seen if it is checked. The main function of this serial number is to tell the manufacturing place and manufacturing date.

Extended data:

Precautions for bag maintenance:

1, users can directly brush oil stains with detergent when cleaning bags, and can lightly brush dark fabrics such as black and red with washing powder.

2. Pure white cloth bags can be directly dipped in thinner bleach (1: 10 dilution) with a toothbrush to remove oil stains.

3. Soak the bag with detergent solution 10 minute (add 6 drops of detergent to each basin of water and stir evenly), and then carry out routine treatment.

4. Before cleaning, users dilute with oxalic acid, then wipe the contaminated area with a toothbrush, and then carry out routine treatment.

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