1. Strong magnetic fixation: Equipped with 5 strong built-in magnets, our magnetic bag fitness water bottle holder carrier can firmly adhere to any metal surface, ensuring that your water bottle and personal items are securely fixed. Note: Excluding water bottle 2. Two side accessory bag design: There is a compartment in the middle that can hold water bottles, and the two side pockets can hold fitness essentials such as phones, keys, wallets, or headphones. 3. Universal and practical: Designed to fit most standard water bottles with diameters below 3.8 inches, ranging from 18 ounces to 40 ounces (500 milliliters~1300 milliliters), made of soft chloroprene rubber, sturdy and lightweight, this gym water bottle holder bag provides a reliable solution for fitness enthusiasts who pursue convenience and functionality. 4. Multi scenario use: The magnetic gym water bottle bag is suitable for gyms, basketball, outdoor activities, travel, dog walking, etc.