The high-quality food-grade Tranzy Yellow Stainless Steel Single Layer Bottles are now sleeker and more stylish than before. The lid is made of BPA-Free material that can be opened with a simple rotation and is leak-proof. Nanobot Tranzy single wall water bottle can keep your water odour less and non-contaminated. Nanobot Tranzy is BPA- Free and made with food-grade stainless steel.