100% leak proof, the ion8 sports water bottle has a vented, smooth liquid flow for rapid hydration. Concave sides and a soft band on this sports bottle provide a comfortable, slip free grip. The Ion 8 bottles flip open with one hand, and lock closed for peace of mind when throwing into a bag.This drinks bottle is made from TRITAN, it is odour resistant, BPA Free, phthalate free, non-toxic, dishwasher safe and suitable for hot and cold drinks from -10C to 96C. And it ionizes your water too! Get supercharged!