Unverified80% confidenceTradeoffTime unknown

扩展式设计与整体重量存在矛盾：带双侧太空舱+硬骨架的空包自重普遍在1.8-2.5kg，装猫后总重可达7-10kg，肩背长途会明显疲劳，长距离更应优先选带滚轮或可拉杆款

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