What information does the bar code on the product packaging bag contain? And why do they all start with 69?

What you are talking about is an EAN barcode, which generally consists of a prefix part, a manufacturer code, a commodity code and a check code. Prefix codes are used to identify countries or regions, and the coding rights are given in ean international. For example, 00-09 stands for the United States and Canada ~ ~, while you say 690-692 stands for Chinese mainland, 47 1 stands for Taiwan Province Province, and 489 stands for Hong Kong Special Administrative Region. Authorization of manufacturer codes is organized by commodity codes of various countries or regions. Commodity code is a code used to identify commodities, and the authorization right is exercised by the product manufacturer. Manufacturers themselves decide which Arabic numerals to use for their products according to the prescribed conditions. At last, the 1 parity code is used to check the correctness of the L- 12 digital code from the left in the barcode. Commodity bar codes are unique, that is to say, only one bar code can be used for the same specification, and the bar codes of different specifications, packages, models and prices are absolutely different ~ ~ Hehe, they are not repeated all over the world, which is also for the needs of international trade ~