It is really cheap to send an aerogramme overseas. At only a rate of fifty cents, you can get your very own aerogramme at most Singapore Post outlets. This postage paid envelope-cum-writing paper comes in four different designs, each with a different scene of Singapore. An aerogramme is designed to be as light as possible, and the sender writes at the back before folding and sealing it up, and dropping it at one of the over 800 post boxes in Singapore. However, it appears that aerogrammes can get damaged easily during transit since it is made of lightweight material. The address of the sender is written on the reverse.
One would write the message inside, and is limited in terms of space. Furthermore, inserts are not allowed in aerogrammes, otherwise it may be sent via surface mail which takes weeks to arrive at its destination.