Since my "darkroom" area is small, I determined not to stock any chems in bottles larger that 1 liter.

With Dektol, I buy the Gallon package and use a scale to divide it into Four zip-lock bags. So far, I have had no trouble finding D-76 in Liter packages but now that I'm using it more often I believe that I will do the same thing, both for reasons of economy as well as for storage and freshness considerations.