| 摘要 |
PROBLEM TO BE SOLVED: To provide a rucksack which is equipped with a speaker system to create clear sound naturally and clearly audible from electric audio equipment and audible together with environmental noise for a rucksack shouldering person around both ears without using headphones or earphones. SOLUTION: A speaker unit 4 to radiate a plane wave toward both ears or the vicinity of both ears of a rucksack shouldering person is placed on the shouldering belt 4 of this rucksack 1. The speaker unit 4 is connected to music playback equipment, etc., housed in a housing part of the rucksack 1.
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