Great for your morning oatmeal or lunchtime gazpacho, the Hydro Flask 18 oz. Food Flask will keep your meal hot or cold for up to 3 hours. Each Hydro Flask is cast from double wall vacuum insulated food grade 188 stainless steel. Vacuum flask will maintain food temperature for 3 hours to ensure a satisfying meal. Vacuum design also prevents scorched hands from hot drinks and condensation from cold drinks. 188 stainless steel is naturally resistant to odors and bacteria. Ice cubes from standard refrigeratorfreezer door ice dispensers fit perfectly. Food Flasks are not microwave safe. Matte finish. 18 oz..