When we go backpacking, after a long and tiring day of hiking we arrive at our camping spot. It is so isolated that it is too hard to get things in and out of the valley. So many of these floats are transported onto the beach by the ocean waves and many of them are still there, due to being too heavy for hikers to remove. I have found some smaller ones, but the one in the photo will probably be there for a long time!
