[KongchangAI]
Unverified80% confidenceTradeoffTime unknown

背负重量与舒适度存在权衡:超轻背负(自重<1kg)多省略金属杆和厚腰垫,仅适合负重10kg以内;追求承重舒适的背负系统自重通常在1.8-2.5kg

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