A diamond-shaped cache container with a screw-on lid. It can be hidden as is, but you can also attach a magnet if desired.
 

 
It is also possible to add log strips of the type "Micro log strips RITR" which is water-resistant and fits perfectly in this container.
 

 
Height: approx. 30 mm
Diameter: approx. 33 mm
Volume: approx. 5 ml
Material: Hard plastic