6g carbs, no cals? Doesn't make sense.

I absolutely love this new sobe lifewater with 0cals!!! But I don't understand...It says it has 0cals per cup since it's sweetened with stevia, but 6g of carbs per cup. Wouldn't that mean that it has around 24cals per cup instead of 0? Anyone know why this is?

Does it claim to have fibre?  In the US, packaged foods don't have to include fibre in their calorie count (but it would still go in the carb count).  If not, something's listed wrong.

It doesn't specifically say that there is fiber in it...

That doesn't make sense.  Carbs are 4 calories per gram, so it should be at least 24 calories, which is not a lot, but should still be listed.

Could it be from sugar alchohals?

Their site says it's sweetened with PureVia.  From their site:

"What is PureVia?

Consumers have been waiting a long time for a zero calorie, all-natural sweetener that doesn't sacrifice authentic great taste and PureVia is the answer. PureVia is derived from Stevia rebaudiana (REB-AU-DI-ANNA), a plant found in Brazil, China, Paraguay and India. The sweeteness component in PureVia is rebaudioside A, or Reb A.

What is Stevia?

Stevia (Stevia rebaudiana) is a plant in the Chrysanthemum family, native to Brazil and Paraguay which is traditionally used as a sweetener, herb and a remedy. Stevia extract has been used commercially as a sweetener in Asia for 30 years and is currently sold in the U.S. as a dietary supplement."

Probably like sucralose, PureVia isn't recognized and burned as carbohydrate in the body.  Since there's not a lot of research on it yet, I don't know if I trust it, however it does look nice.  I'll try it out sometime soon.