Unverified50% confidenceFactTime unknown
全粒面（Full-grain）牛皮耐用性和抗刮性最强但偏硬重，头层修面皮（Corrected-grain）外观均匀但透气差易开裂，二层皮（Split/贴膜皮）2-3年即出现表面剥落，商务包首选全粒面或植鞣头层皮
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Long-term
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