Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: So is this pot 21 qt or 18.5? And it would have to be taller than 9" to can quart jars. True size, please?
Document: I am very pleased with the quality of the pot, not flimsy at all. I really like the glass lid. I was looking for an 18 quart pot, when I read the description on this item it listed it as 18.5 quart capacity. I thought, this should work. When I received the pot is was a 21 quart pot. It is a bit large for what I wanted to use it for,
I searched for a long time for a good stock pot, at least 12qt size but most in my price range were so flimsy and light weight I knew I would be disappointed. I had about decided I would have to settle for an inferior product or take out a loan for a big name brand kitchen product. After stumbling onto this sellers product and reading the reviews, I took a chance and am very happy I did.
This actually turned out to be the perfect size I needed. This will be my goto pot for many years to come.I highly recommend this product. You will not be disappointed.
So far so good. I'm loving this pot; it's not too heavy and I especially like the silicon handles, which make it easy to carry. And for the price I paid, it was quite a bargain. I intend to buy an even bigger one from the seller, if available.....
This is a great quality pot. The metal is a heavy gauge - doesn't feel flimsy at all - and the points where the handles attach are also super sturdy. No wiggling or bending even when the pot is full and very heavy. Obviously super critical when carrying something scalding hot. I'd recommend for anyone.
I love this stock pot!! It is heavy and well made with a heavy enough bottom to keep cooking more even, good for long simmering of stocks soups, chili as well as water bath canning. The lid fits snugly and I like that it is heavy weight glass with a tiny steam vent hole that let's you see contents clearly while cooking without so much condensation blocking the view.
Very good  business. Good product. Love the bottom so things will not stick. AAA all the way  Very good all the way.
I'm looking forward to using this in the many years to come. Sturdy and at a great price. Very happy with my purchase.
Answer: The box it came in says 21 quarts.  It is 9 inches tall/deep, and I've canned quart sized jars in it.  If that helps.