That would require an Uh Murkin to read.

I have not run into this issue when it comes to milk.

On the subject of measuring, you need not measure the volume directly. Weigh an empty gallon carton, weigh a full carton, subtract the smaller from the larger, and evaluate that weight in terms of what mass of milk you have. Since the density is nearly indistinguashible from that of water to the precision we are interested in, you can easily determine if the mass is correctly that of a gallon. If it is very close, it is probably fine. If it is far off, you may want to investigate further, document evidence, and complain as mentioned above.

On the subject of coffee, I gave up on believing those measurements when I realized that a coffee machine cup is not rated by 8oz (us) cups, but 6oz cups (or even 5oz for some Espresso machines) and that you cannot get one rated in standard measure cups. I do my own roasting (when I can get good raw beans), grinding and brewing, and depend only upon my own measurements.

My favorite mug holds 21oz US. My cold-brew rig does about 4 mugs, my french press about 1.33, and my 12 sup drip perc machine (quickest but poorest quality coffee) about 4 mugs.

In Canada price is shown in lb ... until you go to check-out.

I've seen that downsizing happening as described in post #4. That's some sort of dubious sleight of hand for sure.
But doesn't it say on the package how much is in it?
Anything else would be illegal, wouldn't it?

Here I’ve been buying milk 4L at a time for the last 40 years or so. The container size (3 x 1.33L bags, or pouches) and amount of milk has definitely not shrunk.

Depends where and what you’re buying, I guess.

In southern Ontario, and where I’ve visited in Quebec, the butcher, the hardware store and the lumberyard will show both. I don’t remember how it’s done in any other part of Canada I’ve been to.

Back to milk… Ontario where I live has sold milk in metric since we made the switch. When I was a kid, before the switch, we could buy milk in Imperial gallon plastic jugs, while the last of the milkmen delivering Imperial quart glass bottles house to house were still driving around.

At some point, the gallon jug was replaced by something just about everywhere else thinks is weird: bags. You get 3 of 1.33 L clear, unlabelled plastic bags (really pouches) in a labelled plastic bag. The pouches go upright into a tall container (usually plastic) that looks like a pitcher, with a tight fit, and since there are no vent holes in container, you have to tap the container on counter top or table to properly seat the pouch. Then you cut a top front corner off. And sometimes when pouring, hold top back corner of the pouch so it doesn’t flop and make a mess. There can be a bit of an art to it. You want resealable? You have to buy waxed cardboard cartons of 2L, 1L, 500 mL or 250 mL.

TKS

Oh wow, you still have these in Canada?
I think they were great. Very little packaging. I remember those from my childhood, 70s, Central Europe.

Used to calibrate gas station pumps so the gas station won't steal from you. Put a seal after calibrating to show if pump was messed with.

Kinda a local problem thingy.

Maybe the milk gallon issue is a local problem thingy also?

I drink a gallon by myself.To flush out old food in my system.
If you don't want milk to spoil early.

Keep it in the dark. Old saying by my Mom. Yep. I mention locale problem since no mention of gallon shortage on milk on internet.
But. On gas station pumps

Liquid products are ordinarily sold in containers of a predictable capacity, and then they are verified by weight.

I'd say so. Thinking all my milk is from local dairies. It's not the type of product they ship across the ocean. Same for TX to New England.

Seen plenty of multi-year old, torn, and worn cal stickers on gas pumps.

I prefer soy milk.

A gigabyte isn't a gigabyte... and law is not right or wrong like "common sense," whatever that is?!. You're only allowed to kill people if you live in a state where the death penalty is legal!

Cannot stand Soy milk, but Almond milk is a treat!

Grew up to be six feet seven inches because mom kept a cow on the farm.
Soy milk was not around then.

My wife prefers that stuff also because of lactose intolerance in her gene pool.
I don't suffer that. It is just soymilk liquid exlax for me.

Edit: live in state myself that does not prohibit killing or even what kind of knife you carry. Cops like my switchblade from China. Cuz it has window breaker and seat belt cutter.

I'm the opposite, almond milk tasted horrible. Soy milk I can stand and it doesn't go bad as fast as cow, in me or the fridge. Tho I don't drink it straight, only in oatmeal, cooking and coffee.

To each their own unless you're a cow but not a loved one? (Because also to each the masses their own?) If I lived off the grid (or even where it's allowed) I'd be into having a cow to love and cherish.

They’re still here and show no signs of being replaced, in my part of Canada. Many other parts of Canada don’t have them.

You’re right about minimal packaging. On the downside, the packaging can’t be recycled, but being made of a fairly thick plastic film, if you’re frugal they can be reused for vacuum packing things and heat sealed, although in fact I only know one person who did this.

Back again to the OP’s topic, it would be easy to notice - obvious, actually - if someone shorted the amount of milk in these pouches, and reducing their size would force people to buy new milk bag containers. That would get a lot of loud pushback.

TKS

As nearly as I can tell, in the U.S. if it is labeled a gallon/3.79L it must by law be very close to that amount. It is possible for purchasers to order non-standard packaging sizes but that should be reflected on the label.
"Packaging size a - 184 milliliter (ml) (6.5 fluid ounce (fl oz)) aseptic package
Packaging size b - 199.6 ml (6.75 fl oz) aseptic package
Packaging size c - 236.6 ml (8 fl oz) aseptic package
Packaging size d - 236.6 ml (8 fl oz) plastic bottle
Packaging size e - 258.8 ml (8.75 fl oz) aseptic package
Packaging size f - 473.2 ml (16 fl oz)
Packaging size g - 0.95 Liter (L) (1 quart (qt))
Packaging size h - 1.89 L (2 qt)
Packaging size i - 3.79 L (1 gallon)
Packaging size j - Other (as specified by the purchaser)"
https://www.ams.usda.gov/sites/defau...DMilkFluid.pdf