When it comes to the size, who loves the nanos? There are no bugs in them, they do not fit, so most people prefer to find a bigger one. Here is one found in the Netherlands:
The have some sense of the size there is a real size small hand on the picture.
The fun in finding such a big Cahce is that it is in front of you, visible, and as it is next to some farmland with animals potentially you would expect it to be part of the feeding system, or who knows what, so you first do not expect it to be the cahce. And of course it was locked, and lucky for you there is a key for the lock hidden behind a small geaocache logo.
Compare the size to the pen I put on top of it.
When you try to show its size you place objects on it which most people know how big are, I usually go with a local coin, like a 1 euro or 50 cents, but if you see above even a pen is hard to spot on top of this cache.
Larga caches sometimes comes with large logbooks.
Now look inside, there is this huge logbook, more of a logroll. When you take it out you realize the effort put into this cache, and you already know you'll give a favo for this. You know that a cache does not have to be over 2 on difficulty or terrain to deserve a favo.