Hiware Glass Water Bottle with Tea Infuser, 18 1/2 Ounces, Portable, Insulated Thermal Sleeve The Bottle is made of high quality heat-resistant borosilicate glass and is not easy to burst due to the high or low temperature On-the-go water/tea mug lets you brew and enjoy hot beverages on the go BPA-FREE, Cap is made of 18/10 stainless steel, and seals are made of FOOD GRADE SILICONE, safe and environmental The NYLON Sleeve provides a comfortable feeling and against hot. It makes easier to grip against falling off and effective protect glass body from damage, and fits most standard car cup holders Be sure to tighten the bottom cap properly. Sometimes owners can get the lid crooked while tightening them. This will cause a leak as well.