If you wish to know which packaging you should use for sending diagnostic samples:

The Minimailbox is a pre-cut cardboard mailing box intended as external packaging for diagnostic samples of category B. It is permitted as a mailing box, as long as you use it according to packaging instruction P650 in combination with Safetybag Bubble and absorbent tube holders. The Maximailbox is the ‘big brother’ of the Minimailbox. Because of its dimensions it is exceptionally suitable for bulk mailing. It can be used in combination with an exactly fitting polystyrene foam box which is suitable for mailing dry ice. The Maximailbox is also supplied in combination with a SafetyBag and absorbent tube holders. The Minimailbox can be mailed in Germany as maximum letter post and in The Netherlands franked as a letter.

Application
Sending diagnostic samples of category B.

Specifications
White corrugated cardboard, printed with UN number and logo. Approved (BAM, TNT post and PostNL) as external packaging for diagnostics samples of category B, as long as used in accordance with packaging instruction P650 in combination with Safetybag and absorbent tube holders.