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The standard spice jar we reference is the common size found at most US grocery and specialty spice stores.
Half size containers stack very nicely.
 
Brands include:

McCormick
Penzeys
Spice Island
Morton and Bassett
Spice Trend

Full Size and Half Sized Standard Spice Jars

  • Standard Size: 5" tall or less x 2" diameter or less
  • Half-Size: 2 3/8" tall or less x 2" diameter (stack-able)
  • (approximate dimensions for standard size spice container)