The Food Flask by Hydro Flask is like a mini-fridge that you can actually carry. Great for transporting food or hearty liquids to and from the office, school or anywhere in-between, our double wall vacuum insulated technology will keep hot foods steaming hot and cold foods chilled and fresh. The 18/8 food-grade stainless steel interior means non-porous storage with no residual odors or flavors from the previous day’s contents, while our airtight BPA-free, PP#5 lid keeps today's meal as fresh going out as it was going in. The 12 oz Food Flask is just the right size for snacks and in-between meal temptations. It's also small enough to easily throw into a backpack, book bag or purse. Durable and backed by a lifetime warranty, the Food Flask's 3.25" mouth opening allows for easy access for eating straight out of the container, as well as great pouring ability. The Food Flask by Hydro Flask will keep contents hot or cold up to 3 hours. Food Flasks are not microwave safe.