We Gu Yi Supply have specialized in manufacturing water bladder, hydration backpack. hydration flask and etc for more than 15 years. We have a great service team could provide quick reply within 12 hours and we are professional in providing advices to make your dream products come ture.With more than 15 years experiences for manufacturing, we cooperated with many brands and obtained great feedback from them, especially on the quality control and smooth communication for urgent orders.Superb quality is always our top priority! We believe we are a reliable supplier you could always rely on and trust.