The choice of materials plays a pivotal role in outdoor sports water bottle design. Common materials include stainless steel, aluminum, and BPA-free plastics. Each material has its own set of advantages, such as stainless steel's durability, aluminum's lightweight nature, and the versatility of BPA-free plastics. Designers carefully weigh these factors to create bottles that are both functional and eco-friendly. https://www.idwsm.com/product/outdoor-sports-water-bottle/