bdial, in part I agree. Mason jars were invented for canning. But even in canning, whether it is at home or industrial, those lids and caps do rust and corrode. With chemical storage, it just may do it a bit faster. Glass is good, but in a busy dark room they can hit the floor in a flash. Chemical and glass every where.

Also, USPC does have rectangular chemical storage bottles. I purchase some for that reason as well. I have a narrow rectangular cabinet and I wanted to maximize its use. Here is the information if you want to purchase some. They are inexpensive and the caps comes with the bottles.

#66560 16oz wide mouth oblong bottle cap size 43/400 @ $00.71 ea.
#66559 8oz @ $00.58 ea.

I am a retired researcher, it is my first passion and my wife is my second, with everything else falling somewhere far behind. I collect information, lots of it.