[問卦] 背背包固定左邊背帶會下滑是不是脊椎側彎消失
乳題
小弟我最近常出門 會背後背包
但很奇怪 明明兩邊背帶一樣長
但就是左邊會一直往下滑
走一走就要拉上來 很不方便
這樣是不是脊椎側彎的症狀
有沒有八卦??
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