There are a lot of amazing reasons to shop at Costco. From those fabulously delicious (and cheap!) rotisserie chickens and affordable sheet cakes to whole pallets of baby wipes, Costco pretty much has everything you could possibly need or want. So what is Costco’s most popular item?

We’ll give you a hint: it’s something you use every single day, but probably never think about until you’re stuck facing the end of empty roll while trying to do your biz…

That’s right, according to Reader’s Digest, Costco’s top-selling item is toilet paper. The company sells more than a whopping billion rolls every year. It makes sense considering that Costco is the perfect place to stock up on essentials without blowing your budget. But did you know Costco’s toilet paper is top-of-the-line in quality, too?

The signature Kirkland brand is put through rigorous testing to ensure its quality. The company uses toilet paper engineers (now that’s a job title) to test and review its most popular item before it hits store shelves.

So don’t feel weird about tossing that 64-count pack of toilet paper in your cart, because chances are, everyone else at Costco is shopping for the same thing.

—Shahrzad Warkentin