Unverified85% confidenceTradeoffTime unknown
保冷时长与便携性冲突：保温层越厚保冷越久但箱体越笨重、内部容积占用越大；城市短途通勤和一日野餐，软箱轻便且够用，不必追求多日级硬箱
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85%
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Long-term
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