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Ultrapasteurized milk (seems typical for organic milk these days) has a very long shelf-life, 3-4 weeks and beyond.

Is this the same as UHT milk? If so, I find it has give the milk a taste.

UHT is subject to Maillard Browning. Can change taste and smell. https://en.wikipedia.org/wiki/Ultra-high-temperature_process...

yes UHT milk has not preserves the good natural taste, but ESL technology has and it also has 21-28 day life time.