Crocs. They are great seat covers and even block pointy rocks and jabbing branch ends. They also can be a pillow in warm weather when bringing a fleece doesn't make sense. I've used them as elbow rest for reading on a hard surface as well.  I greatly prefer them to flip-flops. I would ford some streams in crocs that I never would in flip-flops. Nothing with serious current but knee-high water for sure. Plus, they may take up more space but they weigh about the same.