Ease of  Some brands offer smooth, even flow from the tube; others do not.
While some brands allow for contents to move slowly through the tube, some don't.
All tubes allow for the smooth flow of contents through them.
Mr. B just said something.
A white dog is standing on Pluto.
men are sitting
A man shoots a basketball.
The dog is carring a purse
a climber stands on the peak of mount everest