HMILYDYK Portable Transparent Glass Water Bottle Cup Leak Proof with Grey Nylon Sleeve Environmental and High-quality Material: The water bottle is made of ultra clear Borosilicate glass, which is known as a kind of special environmental and healthy glass material. The cap is made of 340stainless steel and O-ring seals are made of Food Grade Silicone, safe and health. 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 There are five colors for your to choose: Black, Pink, Green, Blue and Grey. And the glass is super smooth, which is very easy to wash just by clear water. It is very to light to carry, and enough large for hiking, riding or other outside sports. It fit to placed on bicyle cup holder or car. Capacity: There are three sizes for you to choose:12.6oz 14.8oz and 18.5.