Unverified84% confidenceDecision RuleTime unknown
背负舒适度看肩带宽度和背部支撑：肩带宽度<4cm或无胸前扣的折叠包，负重超过4kg后肩部压强过大，长途需选宽肩带(≥5cm)+胸扣+腰封结构
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