Oh you need to protect your $100 - $1,000 lens? Why not go all the way and make sure it's bombproof! The company behind these protective cases is called Mogomoto Prototype who specialize in developing product prototypes for your next big adventure. The Beta Shell lens cases are serious in protecting your valuable and expensive glass with water-tight and rigid polymer shells that are lined with shock absorbing visco-elastic foam. The Beta Shells offer complete protection from impact and weather conditions. You can check if your lens is supported by going to the Beta Shell product page which supports a wide variety of lenses. The Beta Shell cases start at $54. See some Beta Shell action below:

Source Beta Shell