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The Kōld Brewer is more than just a tumbler with a filter, it's going to be an integral part of your lifestyle. Mastermind designed this cold brew coffee and tea maker to go everywhere with you. Created by a mechanical engineer and tested by businessmen, baristas, coffee roasters, and outdoorsman, you'll find it sleek, durable, and refined. Addressing the problems with its competitors, Mastermind made the simplest-to-use & most portable brewer ever. The dual-layer filtration keeps the grounds where they should be - in the filter - for cleaner flavors. Steel and high-strength polymers make it durable. Vacuum insulation keeps it cold 24 hrs. The magnetic lid is simple & fun. Form & Function at its Finest. ✅Cold Brew Coffee & Tea Anywhere: This thing is awesome for craft coffee brewing at home, work, vacation, roadtrips, camping, you name it. ✅Want hot coffee & tea? Just substitute hot water & remove the grounds after 2.5 minutes of steeping. ✅Dual-Filtration: Enjoy super clean-tasting coffee with the dutch-weave mesh & perforated shell. The doubled surface area prevents your filter from clogging, too. ✅No measuring required: We have fill lines to make concentrate or for a balanced brew using the golden ratio. Because life doesn't always let you carry your kitchen scale and measuring tools. ✅Magnetic Slider Lid: It's SO convenient and fun to use! ✅Easy to Clean: The MagSeal lid has no nooks or crannies, and the brewer is dishwasher friendly. ✅Drop it without worry: splash-proof Thicker Steel both inside AND outside make it even more durable. ✅Fits your current tumblers. Our lid fits easily on the YETI & Ozark Trail tumblers.