Holding about 17 ounces, and engineered to keep it hot for a whopping 10 hours or cold for 20, the streamlined, durable Microlite 500 insulated bottle is perfect for hydrating on your commute, at the campground, and anywhere you travel. Stainless steel makes it rugged and pure, and the insanely thin 2mm walls keep the profile trim enough for cupholders and other tight spaces. The cap is amazing. Lock it tight for travel, then push a button and it flips up for easy drinking.