A friend of mine is teaching third grade and is notebooking with spiral bound notebooks. On the day I visited her classroom her children were doing an experiment with "mock rocks" based on an activity in either the Foss or Delta science kit.
She choose to use spiral notebooks because it allowed for more space with glueing and writing. I think the intent is that she would use one for each of her units (so they were the small spiral notebooks - 70 page count I think). I did see that some of the pages had started ripping out just by the way the students were handling them. I think that will improve with time as they move into their next unit/book.