Drinking from a straw and swallowing will increase the amount of gas you have in your pouch, which will both limit the amount of food or water you can have in your pouch at any given time, or may simply cause you to throw up if you over-do it. Having said that, I, like @Berry78 said, have found that if you just pull the liquid into your mouth, then open your mouth and release the air, it works fine. I will caution though that I have a sleeve and I rarely use straws.