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The word button is a commonly used material on a backpack


  Japanese word block also known as the three-button, is a commonly used on the backpack material. Raw materials are generally Nylon or Acetal. It is one of the standard spare parts on the backpack, the general package will have one or two of these buckle. Generally used to adjust the ribbon.
  Here are some of the commonly used word deduction.
  One-way note is the belt with the thing on the backpack. Usually used in the strap chest fixed chest. By the Japanese word buckle in the straps on the vertical weaving, one-way buckle to connect the chest horizontal ribbon, you can move up and down.
  Two-way adjustment of the word buckle, usually also used in the strap, connecting the chest transverse band. With this buckle the cross belt is generally a ribbon cover, the strap to trap, rather than just put the strap on the vertical webbing. So pull tight again no problem. Generally used in large-capacity package.
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