Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: The openning looks small, even though it mentions "Straw-Tek."  Does it actually fit a straw?
Document: Works great, you can even put a small straw in and use it that way. I just wish it didn't cost so much.
The hole might fit a straw put I don't use plastic straws. So it's difficult for liquid to flow plus I think the seal is off and it leaks a little.
I don't like drinking from plastic cups or leaving them in the car here in the Texas heat. I would have given it a five but I think the price is too high and it would have to be an awfully skinny straw to fit through the opening. But I don't like drinking from a straw anyway. So this works for me.
we've totally switched over to mason jar drinking for hot and cold beverages. with or without lids, we have a dozen wide-mouthed mason jars ready to use and these lids make it possible for my 4 y.o. to use them or to take the jars to-go. the straw-tek diamond shaped hole allows a stainless steel straw (or possibly plastic ones depending their diameter) to be inserted. This version offers a slightly faster flow than the original opening.
Great idea... and i'm wondering if i should add a rubber seal or something... but.. no matter how tight i screw down the lid, mine seems to leak. 2 stars for concept but.. if they actually made it into a lid (rather than the liner) it might work a lot better
I love using my mason jars at school as drinking cups and these lids are perfect for that. I like how I can use it for my hot tea or put my stainless steel straw through the hole for my green smoothies. Very useful and durable! I just wish they were less expensive.
I love this! I want to buy more! I like that the drinking home is a diamond so that you can put a straw in it if you would like or you can drink straight from it. They have other ones that have a slit, which would be fine, unless of course you want to use a straw like my kids do. The price seems a little high, but they are sturdy, you'd only need one per person.
We use our mason jars as travel mugs all the time now! We also have cats and it keeps them from being interested in our drinks. I wish I had this brilliant idea!
This is a nifty little item and I am so glad I discovered it. Solves my problem of being able to drink fresh pressed juices from my local juice bar in something other than the odious plastic cup they provide. I am sure I will use it for other beverages too, including water, coffee, etc from home.
These lids are great. I like drinking out of a mason jar so these are perfect. Use them all the time!
Answer: yes, it fits a straw nicely. i use stainless steel straws, but it would also accommodate a plastic straw.