Cylindrical format:
The cylindrical special format covers Großbrief and Maxibrief letter items falling within the following minimum (L: 100mm, W: 70mm) and maximum dimensions (L: 353mm, W: 250mm, H: 20mm or 50mm). Cylindrical format items may be sent as letter mail if:
- the ratio of the long diameter to the short diameter of an oval cross-section is at least 2:1 (height or thickness = shorter diameter < 50mm) or
- circular diameters can be provided with a firmly attached sleeve of at least 150mm x 150mm
The items may have flat ends like a tube.
Creative format:
The creative special format covers items which are neither rectangular nor square in shape (e.g. heart-shaped cards). Creative format items must be sent in an envelope. The price is based on the size of the envelope.
Bottle mail:
Bottle mail may be sent as a letter item if the body of the bottle (excluding neck) is rectangular and flattened, and conforms to the minimum dimensions L: 100mm x W: 70mm.
Flattened in this sense means that the body of the bottle is not round but flat (e.g. a hip flask) and the base of the bottle is therefore oval in shape. The dimensions of the base should have a ratio of 2:1, i.e. the length is twice the width.
Bottle mail items must be shatterproof.