From Sweden. Poste restante.

A jumbo-sized, theft- and weatherproof post box. The slit is big enough for magazines and catalogues but too small for anyone to reach into.
The box takes up to 70 litres of mail without overflowing, so no one need know you are away from home. When you are at home, you can reduce the volume by half by inserting a second base plate (included).
The letter boxes come with a device for fixing them in the ground; the steelsection feet enable you to raise the height. Both alternatives should be set in concrete.