Your cards or envelopes should be:
A minimum of 90mm x 140mm
A maximum 305mm x 381mm x 20mm (depth)
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:
Belgium
Cyprus
Czech Republic
Denmark
France
Hungary
Germany (1kg and depth of 50mm only)
Latvia
Luxembourg
Netherlands
Norway
Portugal
Slovakia
Slovenia
Spain
Sweden
Switzerland
United Kingdom
Items with the following dimensions are also classed as large or bulky:
Envelopes
Minimum surface of at least 90mm x 140mm
Maximum length, width and depth combined of 900mm, with no one dimension exceeding 600mm
Packets
Minimum of 100mm x 70mm x 25mm (depth)
Maximum length, width and depth combined of 900mm, with no one dimension exceeding 600mm
Items in roll form
Minimum length plus twice the diameter of 170mm but the greatest dimension must be at least 100mm
Maximum length plus twice the diameter of 1040mm but the greatest dimension may not exceed 900mm