Product review (5 stars): Perfect while playing yard games!
These holders are great.  The shape of the spikes makes it easy to press down into place with your feet.  I recently used them on a beach with loose sand and they stayed put all day.  A bag of chips even fit quite nicely between the two can holders, which was very convenient.  These are wonderful for having some beverages while playing yard games.  The design is simple, but very effective.