Your cards or envelopes should be:
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A minimum of 90mm x 140mm
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A maximum 305mm x 381mm x 20mm (depth)
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Maximum weight allowable is 50g per item worldwide
If you need to send heavier items, contact your Account Manager. Large items, weighing up to 2kg, can be accepted for the IBRS service for the following countries only:
Items with the following dimensions are also classed as large or bulky:
Envelopes
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Minimum surface of at least 90mm x 140mm
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Maximum length, width and depth combined of 900mm, with no one dimension exceeding 600mm
Packets
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Minimum of 100mm x 70mm x 25mm (depth)
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Maximum length, width and depth combined of 900mm, with no one dimension exceeding 600mm
Items in roll form