ykk is the name of the zipper company.
ykk is the name of the company that makes zippers
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You will know when it is fake if you look inside of the bag at the back of a zipper. If you don't see YKK, it is fake. Also, if you compare a real one to one you are not sure about, you can feel the difference through the fabric.
A zipper style made by YKK. It's a rugged plastic zipper with large teeth.
YKK or Yoshida Kogyo Kabushibibaisha.
The YKK on zippers stands for Yoshida Kogyo Kabushiki Kaisha which is the name of the founder of the Japanese zipper company.
You'll know if your jansport bag is real when there's YYK behond the zipper
The best advice I can give you is write a letter to a zipper manufacturer such as YKK, JNZipper, or Supreme Zipper Industry
It is a zipper company. these zippers are used worlwide for many famous brands
That's the company that makes the zipper. The original company called San-S Shokai in downtown Tokyo was founded in 1934 by Tadao Yoshida.
In most cases you can look at the backside of the slider for a number and possibly a letter, such as "10D".