It is a straw, and you can drink it full. I love love these water bottles! Here are some of my favorite color options!
I have a 40oz and I love it. I bring it to work with me all day just because it holds so much water it's easier to use than some of my other ones. Here's my favorite color combos:
I have given lots of love to my Hydro, but easily switched to my Stanley. UNTIL they came out with this tumbler and I'm obsessed! Highly recommend.