2000 ML YEAST BOTTLE

Based on another review I expected this flask to have a flat bottom. Mine does not, it has a concave bottom that is causing my stir bar to be thrown occasionaly. When I called Customer Support I was informed that these flasks are made in China and he couldn't guarantee me a flat bottomed flask. So I will return it and source a true Pyrex flask from another source for the $2 dollars more. Shipping was lighting fast though.

Response from William's:

All the flasks we in stock have a very slight (barely noticeable) dip up in the center of the flask which appears to be part of the design. We have sold hundreds and not had a complaint, and many of our customers use stir plates.  Please return this to us, filling out the back of your receipt. Be sure to write how much you paid for return shipping and we will reimburse you for this. We need it back because we are not sure if you have one like all the rest, or one with a bottom that is defective.  Thanks!

Pros: Excellent size and workmanship.  Keep in mind that these things are hand-blown -but they're exactly as advertised.  I ordered two of them, put them right on the stove and boiled the starter wort, put them in the sink for an icewater bath, no issues whatsoever.  They take #10 bungs (I don't use the foam ones, but standard rubber/airlock combo).  These are shipped very well protected.
Couldn't be happier! 

 Cons: None whatsoever.  Exactly what I expected to get.