Triple Tree sports water bottle is made of 18/8(304) high quality stainless steel. Food-grade stainless steel is used in the food, brewing and wine-making industries so it does not rust, corrode, retain or impart a taste. No matter how many times you refill it, and no matter what you put into it, this bottle will keep your drink fresh, crisp and clean tasting. Its stylish design leak-proof and portable hook are your best choice as a gift. Features: 1. High-quality food grade 18/304 stainless steel, scratching resistance, 100% BPA Free for health-safety. 2. Specially designed stainless steel cap and silicone ring provide a strong seal,whether it is tilted or inverted, no leakage. 3. Large opening on smooth wide-mouth bottle not only makes it easy to add ice cubes or fruit,it doesnt hurt your mouth. Fits more water purifiers and filters, making washing a breeze. 4. Portable hook design, perfect for your gym, bag, car, bicycle and backpack to enjoy your long hikes, trekking, hot yoga class, long load trip, or any other outdoor activities. 5. The vacuum insulated double walled water bottle allows you to enjoy drinks at an ideal temperature. 3 sizes of uninsulated single walled water bottle for you to choose. Specification: Material: 304 Food-Grade Stainless Steel Style: Uninsulated Single Walled / Insulated Double Walled Color: Silver / Black / White Capacity: 17 / 26 / 30 / 34 oz Package List: 1 x Stainless Steel Water Bottle 1 x Silicone Ring 1 x Manual