| 摘要 |
The present invention relates to a backpack comprising a shoulder belt having two ring-shaped tubes provided with respective air-injection portions so as to enable a user to inject air into the tubes to inflate the shoulder belt and to thus enable the backpack to tightly contact a shoulder of a wearer. Thus, the backpack is prevented from slipping down from the shoulder of the wearer or from moving sideways, thereby protecting the waist of the wearer from being burdened to thus prevent spondylopathy and fatigue, and rendering user activity convenient. The shoulder belt of the backpack of the present invention has the ring-shaped tubes provided with respective air injection portions. In addition, two tubes of the shoulder belt are interconnected via a pipe, the length of each tube is extended toward the body of the backpack such that the length of each tube is the same as that of the body of the backpack, and the tubes are coupled to a back of the backpack. Preferably, the shoulder belt may be wrapped in fabric or the like so as to be protected and connected to the body of the backpack, or the shoulder belt may be made of fabric or the like, and the upper portions thereof may have spaces for accommodating said tubes, respectively.
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