| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that a rucksack or backpack to be used on a person's back hinders his or her walk when it is not filled enough because goods therein move up and down as he or she walks, or needless labor is required for a long time walk because the weighted center of the rucksack is positioned low. SOLUTION: The rucksack or backpack to be used on a person's back with goods contained is fixedly provided with an air bag on the bottom surface such that it can be inflated or deflated in volume by putting or taking air into or out of the same from or to the outside so as to be adjustable in the volume of its bottom part. COPYRIGHT: (C)2006,JPO&NCIPI
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