Packages
The capsules can be loaded with packages up to 5 cm in diameter and 30 cm in length. Their weight can be up to 3 kg. Generally these were rolled-up telegrams, but any package within the set limits could be transported.
For obvious reasons, dangerous and corrosive substances, which could damage the pipeline, were banned. On the other hand, the travel speed could be adjusted, allowing for transporting fragile packages.
Read more about this topic: Prague Pneumatic Post