It’s a nano but appearances are really, really deceiving.
To open the container: Pull the pin out. Push up slightly from underneath to release the hasp. If the trapdoor doesn’t fall open, pull the hasp downward. Remove the cache by siding it upward and out.
When replacing the cache in the container, be sure to slide it into the slots.
The log is in the vial. Bring tweezers. BYOP.
Nota Bene: If you are caching in the late spring or early summer, mosquito repellent is highly recommended. They’re wicked this time of the year.