When I saw Kim Kardashian's "What's in My Bag" video come across my "For You" page, I expected the usual lineup of Kardashian-brand staples. To my surprise, it was more than a promo reel - it actually revealed a few of her genuine favorites. And out of everything she shared, one product immediately caught my attention: a now-viral $11 lip stain that just so happens to be one of my new go-tos. In a TikTok video with Vogue, the Skims founder revealed she uses the Sacheu Lip Liner STAY-N Peel Off Lip Stain. And much like Kim herself, this product is far from average. It's taken over both TikTok and Amazon, earning cult-favorite status - a rise to fame almost as quick (and iconic) as the Kardashians. See it! Get the Sacheu Lip Liner STAY-N Peel Off Lip Stain for just $11 (originally $14) at Amazon! Please note, prices are accurate at the date of publication but are subject to change. Jennifer Garner's $2,570 Tote Is Seriously Spacious - This $21 Lookalike Fits Just as Much This makeup essential has become both a celeb and shopper favorite because - wait for it - it actually works. Meant to act as a lip liner stain, the formula delivers up to eight hours of waterproof, transfer-resistant color that lasts through coffee, cocktails and everything in between. There's no smudging, no reapplying - just perfectly defined lips that stay put all day. The initial application is foolproof. All you need to do is trace along your lips, wait 20 minutes, peel and you're ready to go. Plus, the color payoff is next-level. Each shade delivers rich, consistent pigment that mimics the look of real liner without fading or bleeding. Another major perk is that the product is formulated with skin-loving ingredients, such as hyaluronic acid and vitamin E, which keep your lips soft and hydrated beneath the stain. Kardashian is far from the only one with this lip stain in her bag - plenty of shoppers are stocking up on it, too. With more than 40,000 purchases in just the last month and over 9,000 perfect ratings, reviewers are giving it the "best lip stain award." Even through eating and kissing, customers have claimed that it "lasts hours," which is perfect for when you "don't want to keep reapplying your makeup all night." Available in ten flattering shades, shoppers can choose from soft neutrals like p-INKED to statement shades like getREADy and PLUMped. The Sacheu Lip Liner STAY-N Peel Off Lip Stain is also cruelty-free and vegan, making it a beauty pick that looks good and feels good. So, it turns out that Kardashian's makeup bag isn't all luxury or family labels - when an affordable product performs, she's all in. Even better? Right now, you can snag this lip liner stain for 20% off for Amazon Prime Big Deal Days! It's the perfect time to add the star-approved staple to your makeup routine before it inevitably sells out. See it! Get the Sacheu Lip Liner STAY-N Peel Off Lip Stain for just $11 (originally $14) at Amazon! Please note, prices are accurate at the date of publication but are subject to change. Looking for something else? Explore more from Sacheu here and more lip stains here! Don't forget to check out all of Amazon's Daily Deals for more great finds! Taylor Swift's Adidas Sneakers Are Still on Amazon - But Not for Long Us Weekly has affiliate partnerships. We receive compensation when you click on a link and make a purchase. Learn more!