The following table lists recommended ISO envelope sizes. The range includes: C sizes, which are for normal A size enclosures; three B sizes, which are used to enclose return envelopes and matter enclosed in C size envelopes; the hybrid B6 / C4 size; and the DL size (the survivor of a D series that was not accepted as an International Standard). Sizes are given in millimetres
DL 110 × 220
C6 114 × 162
B6 125 × 176
B6 / C4 125 × 324
C5 162 × 229
B5 176 × 250
C4 229 × 324
B4 250 × 353
The relationship between the envelopes and their enclosures is shown in figure opposite. In addition to the ISO range illustrated, an envelope 190 mm × 265 mm is provided for enclosing B5 publications.
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