Several years ago there was a cache hidden very near where this one is. What made this particular cache special is that the container was a ceramic bird sitting atop a small hat, with a film can shoved in a hole in the bottom of it. The film can went missing a few times but the bird continued to sit in the tree, even long after the page was archived! The bird is finally gone but its legacy lives on in the form of this cache, even though there certainly are no ceramic birds here anymore.
You're looking for a green bison tube hidden in typical fashion. As mentioned before please BYOP. You may have to shake some pesky pieces of cedar tree off of you after finding this cache, but as a geocacher you should be well accustomed to doing so. 