美国采购需求：背包、腰包、袜子、运动服饰、登山杖、运动器材

I purchased two 0.5L bottles in August, but I've encountered an issue with one of them. Unfortunately, it started leaking after I used it for the second time. I'm concerned about the quality and would like to discuss this matter further. Can you please provide guidance on how to resolve this? I'm located in the United States, and I'd appreciate any information on potential replacements or refunds available for defective items. Thanks for your assistance!