Message in a bottle - from Iceland Post

Iceland Post has started selling and distributing bottled messages – "Message in a Bottle". These items which can be purchased in post offices are amusing message holders made to be sent as mail to friends and relatives in Iceland and abroad.
The item consists of a plastic bottle (26 g) with a nice picture from Iceland on one side and an address label on the other.
The bottle contains a sheet of paper on which the sender writes his message. He then puts the sheet in the bottle, seals it with a special cork and adhesive tape (which is found on the bottle neck) and mails the bottle just as he would any other post. The postal service will then bring the bottled messages to receivers all around the world.
Bottled messages can be obtained with two pictures - of a volcanic eruption and the northern lights (aurora borealis).