Liquids and Sleeve...
I think Frisco's recently-posted info about the pyloric valve will answer the stretching question. If the valve is closed, then stretching can occur, presuming the esophogeal sphincter doesn't release first/vomiting doesn't happen. The veterans can set me straight but the stretching comes from long term overfilling.
I will say that the times that I downed something too quickly, it was uncomfortable. I have strict instructions from my doc that 8oz of thin/clear liquids should be consumed over approximately a 1 hr time span. I'm ok with that if it means I stay comfortable.
The best analogy I have heard is the sink analogy. Think of a sleeved stomach like a sink. If you dump a bowl of liquid in a sink, it backs up temporarily but clears quickly. If you dump a bowl of thick soup in a sink, it'll back up and clear more slowly. If you dump a bowl of pot roast in a sink, it won't clear.
Sleeved 6/12/13 - 100 pounds lost to get to goal!