The 40 oz (1.2 L) DYLN Bottle enhances water by increasing the pH up to 9+ to create alkaline antioxidant water while keeping it cold for up to 24 hours. The mouth opening is compatible with the DYLN Straw Sports Cap. The interior of the bottle is made with the highest quality 316 surgical-grade stainless steel. With the flexible handle cap, water inside of the DYLN Bottle never touches any plastic. The exterior of the bottle is made of durable 304 food-grade stainless steel. An added copper liner enhances the double-walled vacuum insulation performance to keep your water cold for up to 24 hours. Add the Large Silicone Bottom Guard to your 40 oz DYLN Bottle to protect it from scratches and dents. It will double as a portable dog bowl to keep your furry friends hydrated when you are on the go.