They're ~$10, non-toxic, colorful, and come in their own zip-able container, which is always a plus. They're thick enough to work with smoothies and frozen drinks, but not so thick that you get a ton of liquid when you use them with normal viscosity beverages. They come with a plastic ring to prevent slipping from portable cups (like our favorite RTIC version), but they work just fine in all sorts of open-topped glasses, too. You could even use them to identify drinks at a party!
I sorta stumbled into this but I love it. Every week I receive 4-6 packages that I pay little or nothing for. All that's wanted in exchange is a review on Amazon and mentions on social media. Click the link or image and learn how to become a product reviewer, even if you don't have a blog!
BOOK CLEANER Absorene A favorite of museum curators, archival restoration experts, and libraries, Absorene Paper & Book Cleaner is a dry cleaner that gently & safely brightens and cleans paper and book cloth. Absorene draws dust and dirt from surfaces, and also works for prints, oil paintings and fabric. 15 oz.