Securely attaches water bottles up to 1.5 liters with a small neck and a cap size height of 10 to 22 mm. Split key ring included for attaching keys, badges, IDs, and other essentials. Durable and lightweight design for outdoor activities and everyday use. Convenient for hiking, camping, traveling, and on-the-go hydration. Versatile design for easy attachment to belts, bags, bikes, or gear.