BPA is the more common name for Bisphenol A, a chemical compound linked to a variety of health issues and diseases. BPA is used in a variety of plastics - but not the YETI Rambler™. All YETI drinkware is BPA-free, including Triple-Haul caps, MagSlider lids, and accessories. We think what goes inside our Ramblers™ is just as important as how it performs outside. With YETI, you get the freedom to go anywhere with on-hand hydration combined with BPA-free peace of mind.