- Durable Three-Layer Construction: This bike water bottle holder bag features a waterproof polyester exterior that is both wear-resistant and scratch-resistant. The middle layer is crafted from shock-absorbing pearl cotton, providing heat insulation, cold resistance, and impact protection. The inner layer is lined with aluminum foil for superior heat retention and cooling effects. - Generous Size: Designed to accommodate most 12-32 oz cups and water bottles, this drink bag measures 9.25 inches (23.5 cm) in height and 4.3 inches (11 cm) in diameter, making it a versatile choice for hydration on the go. - Effortless Installation: Equipped with three strong adhesive strips, our waterproof bicycle bottle bag can be easily mounted on your bike frame. The secure fit allows for quick removal and reattachment, perfect for users who frequently transition between rides. - Adjustable Drawstring and Side Pocket: The holder features an adjustable drawstring for a snug fit, ensuring your beverages stay secure, whether it's a coffee mug, soft drink, or stainless steel bottle. Additionally, a convenient side pocket lets you store small essentials like your wallet, sunglasses, phone, or keys. - Use Scenarios: Ideal for daily commutes, long rides, or casual outings, this holder keeps your drinks accessible and your essentials organized. Whether you're cycling to work, enjoying a day at the park, or hitting the trails, this bag enhances your biking experience with practicality and style.