The 890 ml Stanley IceFlow™ leakproof flip straw tumbler is made from durable stainless steel and features double-wall vacuum insulation to keep drinks cold for up to 12 hours, or 48 hours when iced. A built-in flip straw allows easy, effortless sipping, while the convenient folding handle makes it ideal for carrying on the go. Designed to fit most car and bike cup holders, this tumbler is fully dishwasher safe for everyday convenience.