The way postage is priced has now changed and takes into
account the size, depth and weight. Mail fits into one of these
three categories:
Letter (L):
Up to 165 x 240 and less than 5mm depth, max weight 100g
Large Letter (LL):
Up to 353 x 250mm and less than 25mm depth, max weight 750g
Packet (P):
Over 353 x 250mm and over 25mm in depth, max weight 1kg
Paper quality is expressed as grammes per square metre (gsm).
Usually the higher the gsm the stronger the envelope.
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