Unverified85% confidenceTradeoffTime unknown
保温时长和重量便携性冲突：真空层越厚保温越久但整机越重，1.5L以上真空款空重常达700g-1kg，装满后超1.5kg，每天步行/骑车通勤会明显负担
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85%
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Long-term
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