vacuum insulated mug The flip open design allows you to open and close the lid with one hand and the one-button open mode allows you to drink water more conveniently and it's 100% Leakproof BPA FREE Food Grade Material: Made of premium high quality 18/8 304 food grade stainless steel, silicone and plastic BPA free Easy to carry The perfect 300ml size water cup Coffee cup suitable for all kinds of scenes, which is a good choice for home, office, road trips, camping and traveling, hiking, it can be hung in a backpack and fits most car's cupholders, it a good gift for family and friend. This coffee mug car is also a good choice for both men and women.