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>>1 US liquid quart is about 946.353 milliliters.

Why not just say 1 litre and have the same limit as the rest of the world.

The surface level answer is "for Ronald Reagan reasons":

https://en.wikipedia.org/wiki/Metric_Conversion_Act

Because we have quart-sized ziplock bags here, liter bags not so much.

...the rule wasn't implemented because you have quart sized bags, it's the other way around. Also it's not like 1 litre bags would be difficult to make and procure.

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