[KongchangAI]
Unverified80% confidenceTradeoffTime unknown

背包容量与防走失功能存在矛盾:容量越大(>5L)越重,加上孩子零食水杯后,背包下坠会拉扯肩带导致孩子不适甚至勒到腋下;1.5-3岁选2-3L小容量最合适

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80%
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Long-term
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