Letters and postcards must be:
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No larger than C5 in size or half the size of an A4 sheet, also known as POP or Post Office Preferred
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Minimum 140mm long x 90mm wide x 0.18mm deep
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Maximum 235mm long x 162mm wide x 7mm deep
Large envelope sizes can be:
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Up to C4 in size, also known as a ‘flat’ item
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Minimum 140mm long x 90mm wide x 0.18mm deep
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Maximum 400mm long x 300mm wide x 25mm deep
We also cater for three-dimensional items like boxes, tubes and larger envelopes:
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Minimum 100mm long x 70mm wide x 25mm deep
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In tube form the maximum dimensions, or the length plus twice the diameter, must not be greater than 1,040mm, with no dimension exceeding 900mm