The Ultimate Stainless Steel ECO Water Bottle Leak Proof Design The Bintiva bottle is crafted from the highest quality materials, and incorporates a unique design so that it never leaks, or leaves any condensation or sweat on the exterior of the bottle. Safe and Environmentally Friendly Materials Unlike some other brands, the Bintiva ss water bottle is made with food grade, type 304, 18/8 stainless steel on both the inside and the outside of the bottle. This provides the user with a bottle will not rust, leak, or have any residual metallic taste. It is also 100 percent free from BPA phthalates and other harmful metals and toxins commonly found in plastic and aluminum bottles.