Design in mind: with it's easy-access wide mouth, the sleek design holds the same volume of liquid as other leading water bottle brands. Also, safety is top-of-mind, as the bottles are made out of non-toxic bpa-free plastics & 18/8 food-grade stainless steel. Slip-free grip: unlike other leading water bottles, hydro flask has a powder coat, which gives you a solid grip. The powder coat works with the premium tempshield insulation, which prevents condensation from forming on the outside of the bottle, to give you exactly what you want in an everyday refreshment delivery system.