A few months back these travel sized sprays came for free with a magazine - I think it was Elle, but don't quote me on that. And I'm glad it did, as it's not something I would have picked up at a store, but I'm certainly happy to have it in my stash!
To cut a long story short, this does exactly what it says on the tin. While it doesn't quite thicken individual hair strands, it gives insane volume, instantly giving the impression of thicker, bouncier and more voluminous hair. An absolute winner!