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A4文件夹的内袋实际可用尺寸需≥310×220mm才能无褶皱容纳A4纸（210×297mm）加封套，标称A4但内袋刚好297mm的产品放入后会卷边

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Unverified补习袋内部净高需≥32cm才能竖直放入A4文件袋与教辅（A4尺寸为21×29.7cm），标称A4实际卡在30cm以下的袋子会导致教材露头折角90% similar Unverified书包分隔袋内部尺寸需比拟装物品各边多留1-2cm余量，太贴合会导致取放困难；主袋尺寸选购时以书本长边为基准，A4课本按30cm×22cm预留86% similar Unverified绘本袋内部净尺寸应≥33cm×27cm才能平放国内主流大开本精装绘本（多为25cm×28cm或更大），A4绘本袋（33cm×24cm）容不下多数8开精装本84% similar

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