Air Tight, but Not As Big As Advertised
I read that Magnesium Chloride is more readily absorbed than other types of magnesium so I made the switch.  Unfortunately, magnesium chloride will absorb any moisture within a mile if not kept in an airtight container.  When I put the capsules in my regular pill case, after a few days the magnesium chloride capsule would start to melt and by day 5 every pill in the sections would be glued together with the stuff.  So after some research, I got this "waterproof" pill case to see if it would help and it works wonderfully.  The magnesium chloride capsule for day seven is just as pristine and the one for day one.  On the down side, I can only fit a maximum of three capsules in each section, but since I only need it for one, it works great.
Rating: 4 stars