Courier envelope document bag waterproof thickened waxing in tong yun da shen tong blank yuan tong express printing custom letter

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Color classification:: Yunda large envelope thickness 33*23.8 Yunda large envelope thin 33*23.8 Yuantong large envelope thickness 33*23.8 Yuantong large envelope thin 33*23.8 Zhongtong large envelope thickness 33*23.8 Zhongtong large envelope thin 33*23.8 Shentong large envelope thickness 33*23.8 Shentong large envelope thin 33*23.8 blank large envelope thickness 33*23.8 blank large envelope thin 33*23.8 Yunda small envelope 16 ×25 yuantong small envelope 16 ×25 Shentong small envelope 16 × 25 Zhongtong small envelope 16 ×25 blank small envelope 16 × 25 Zhongtong small envelope thickened 16 * 25 blank small envelope thickened 16 * 25