The phrase "a jar containing a" is correct and usable in written English.
It can be used when describing the contents of a jar, often in a context where you want to specify what the jar holds.
Example: "On the shelf, I found a jar containing a variety of colorful candies."
Alternatives: "a jar filled with a" or "a jar holding a".
Only yesterday, Dennis, holding a jar containing a spider, told the neighbor girl: "Stop screamin', Margaret!
Think of a jar containing a million marbles, half of them red and half blue.
Young Ana, pre-growth-spurt, carries a jar containing a butterfly's cocoon.
One recent afternoon, a neighbor arrived with a jar containing a tiny dormouse, one of dozens overrunning her house.
Phillip Galea, 31, was allegedly found with five tasers, a jar containing a small amount of mercury, and a copy of The Anarchist Cookbook.
Graduate student Ingrid Guha holds a jar containing a clear liquid that looks like water to the naked eye, but it's actually an emulsion of oil and water at the nanoscale.
During a recent visit to one of the company's labs, Siying Chen, a chemist whose skills would not have been needed in the industry a decade ago, opened a clear jar containing a rubber strip and waved her hand to sweep up the bouquet of what smelled like fine leather.
Gruber holds a glass jar containing a cannonball jellyfish, a specimen Agassiz brought back from Georgia, which is stored in the bowels of the Harvard Museum of Comparative Zoology.
Santos unscrewed the lid of a widemouthed glass jar containing a kelp vinegar he had prepared two months earlier.
Garden Tiger A century ago, a jam jar containing a Garden Tiger moth was the favoured pet of many small boys.
Mining a similar theme is Rachel Berwick's sculptural installation, "A Vanishing; Martha" (2003), consisting of an upturned bell jar containing a cast amber sculpture of a passenger pigeon.
