1. Adjustable spring button. The closure features an elastic buckle that allows for adjusting the tightness of the cord to accommodate bottles of different sizes. This water bottle cover can securely hold bottles with a diameter of less than 3.54 inches, making it ideal for daily travel needs. 2. Wide applications: Equipped with a Dshaped buckle, the shoulder strap bag can be attached to other gear, large backpacks, or belts using carabiners. It can also be hung on bicycles, walls, etc., and is for carrying small outdoor essentials like flashlights and keys, offering convenience and versatility. 3. Bottom mesh pockets design: The base of this water bottle holder features breathable mesh pockets. This design ensures proper drainage even on rainy days, preventing water accumulation. 4. Material: The MOLLE bag is crafted from durable 1000D fabric, ensuring wear resistance and maintaining its shape over time. Reinforced stitching enhances the bag's longevity.