To provide a method for fixedly binding a bag to desk legs in a simple way to prevent the bag from slipping off from a hook at a desk side and dropping down, improving a conventional bag which is only hung at the hook of the desk side and happens to be tilted obliquely or to be slipped off to drop down when the bag is touched by a person passing by, because the bag is only hung at the hook of the desk side in a schoolroom and a tool or an instrument is taken out from the bag and is used as a occasion demands.

The dimension of the bag is made to a size that does not jut out from a full width and full depth of the desk and does not reach a floor when it is hung at the desk side. The bag is provided with a plurality of short bands with belts or Velcro tapes for the purpose of fixing the bag to desk legs at the parts of the bag where the bag touches front and rear legs of the desk after the bag is hung at the desk side, and is fixedly bound and fixed.