A large letter is precisely given by the dimensions: It is 100 to 353 mm long, 70 to 250 mm wide and up to 20 mm high. The large letter must weigh no more than 500 g.
With a large letter can not only send documents, but also small items and goods are shipped as a side dish.
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"Großbrief" simply means "large letter" -- "groß" = large; "Brief" = letter.
So an envelope of A4 size or thereabouts. I imagine you choose whether to send it registered or recorded etc.
A large letter is precisely given by the dimensions: It is 100 to 353 mm long, 70 to 250 mm wide and up to 20 mm high. The large letter must weigh no more than 500 g.
With a large letter can not only send documents, but also small items and goods are shipped as a side dish.
Large letters can be sent by registered post.