✅ DURABLE & EASY SQUEEZE: The BPA-free 28 oz. reusable plastic sport bottle is made of durable, easy squeeze polyethylene. The one-way valve provides a powerful squirt and prevents spills and allows for maximum hydration. The lightweight design makes the bottle perfect for drinking water during exercise, riding a bicycle, athletic events, fitness, outdoor activities, spin class, soccer, hiking, camping, youth sports, triathlon, and school athletics.