Your first time floating through the Grand Canyon can never be beat. Until, perhaps, you go again, shedding the comfort and ease of rafts and stuffing your home for 13 days into a kayak.  The first question I get asked...how do you fit a groover in a kayak?       Well, you ditch the bulky metal box and imagine a capsule that will stay absolutely, 100%, undoubtedly, undeniably, securely closed.  …