I've never noticed that before either. That's definitely new. I do the same and have brought liter sized bags of protein powder on before with no issue. It would suck if it now is subject to the 3 oz rule. I suppose I could break it up in to daily servings instead of a weeks worth in one container but that's pointless effort. Plus if I'm carrying a week's worth that would take up the majority of my 1 liter bag.