Dan_Musicant writes:

The problem is that I'm uncertain if these containers will indeed be air
tight or not.

Putting a dessicant in a leaky or permeable container just lengthens the
time the interior stays dry. Eventually the dessicant saturates and
becomes inert. In the case of a deliquescent like calcium chloride, it
turns into a nasty, corrosive goo. Thus the advantages to silica gel or
molecular sieves.