Eriotpy Glass Water Bottle 12OZ 18.5oz with Color Protective Bag (Green) High strength, hardness and wear resistance. High strength, hardness and wear resistance. Easy to wash: The glass is super smooth, which is very easy to wash just by clear water. Protective Bag is made of Nylon which provides a non-slip surface and helps prevent from heat and protect bottle body away form breakage, and it is Shatterproof.And there is a loop on the sheeve, which makes the bottle convenient to carry, perfect for travel and sports The cap is made of 340stainless steel and O-ring seals are made of Food Grade Silicone, safe and health.