Canadians, God love them. It's certainly not clear to US citizens.
The odd size of 12 oz, 1 and 1/2 times as big as a cup jar, the odd size of 24 oz, one and 1/2 times as big as a pint, are also odd sizes that I use.
Last year there was a jar shortage and the prices were jacked up. So we posted on some local forums for jars. We would pay 40 cents a quart, 35 cents a pint, and 30 cents for smaller. We picked up about 750 jars from neighbors and people that had them in their basements but didn't want to run a rummage sale and try to sell them. Some didn't even want to go into the basement and carry them upstairs, so we did that.
I ended up with some blue jars too. I told the sellers I'm not wanting other sizes and I'm not wanting antique jars. I'm not willing to pay for those. That didn't stop people from throwing them in for free with a hundred jars. I also bought a pressure canner brand new for 10 dollars and I gave it to a niece because she is just starting to can things and she gardens and does chickens.
I use the too large jars (anything larger than 32 oz) for dried goods. I use the middle sizes that are not pints or quarts for sauces and condiments like ketchup and brown sauce.
I love having the jars.
So out of that mess, I have some blue jars from all different periods in history and they are amazing. I use them for pantry storage for grain and legumes and dried herbs/teas, upstairs.
This is what that looks like. I think they are beautiful.