This is a small container, large enough for a little pencil, log and small trade items.
PLEASE return the cache to its container in the same location as you found it. To open the cache, GENTLY rotate the top so that it freely moves. If you hit some resistance, you are going the wrong way. DO NOT FORCE the cache to open - this will break it.
Once the cache is open, your challenge is only half way complete... PLEASE BE SURE TO COMPLETELY CLOSE the cache. If it does not return to the completely closed position, you haven't solved the puzzle yet, so please try again. If you are not sure, you can check your efforts with the spoiler pictures.
If you need help, feel free to contact me for a solution rather than to break it open.