Unverified85% confidenceDecision RuleTime unknown

容积选择遵循人数公式：2人短途选300-400L，4人一周长途需400-500L，5人以上或带露营装备选550L以上（如Thule Motion XT XXL 610L）

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85%

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Unverified230g规格适合轻量化短途，450g规格适合多人或多日行程；选购前按每人每天约50-70g用量估算所需容量73% similar Unverified容积选择按需：300-400L适合2-3人短途；400-500L适合4-5人家庭周末出行；500L以上适合长途露营或滑雪装备运输72% similar

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