Unverified80% confidenceDecision RuleTime unknown
材质柔韧性优先选TPU（-30度不脆裂、可拉伸约300%）而非PVC，PVC低温易硬化开裂，不适合冬季户外及经常弯折的拉链部位（如背包底部、袖口）
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Long-term
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Unverified材质耐用性看克重和涂层：牛津布选600D以上耐磨抗刮，防水需带PU/PVC涂层或TPU复合层，普通210D尼龙轻便但易磨破边角80% similarUnverified承重需求高（放书籍、玻璃罐）选硬质PP或ABS板，硬度邵氏D70以上不弯折；仅分隔轻质衣物选软质无纺布或PVC，可弯折省空间78% similarUnverified材质厚度看单位克重：涤纶TPU复合料500D以上耐磨可户外拖拽，尼龙70D轻量款仅适合背包内部收纳，装重物或磨石地面会破损78% similarUnverified厚材质（如0.5mm以上TPU）更耐磨抗刺穿但重且收纳体积大；薄款轻便易收纳却怕尖锐物划破，冲浪/岩石漂流选厚款，城市防雨选薄款78% similarUnverified600D TPU层压面料耐磨性突出，适合粗糙地面、岩石环境及装载硬质装备，但整体包体偏硬挺、不易压缩收纳78% similar
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