RihanUltra Clear Spill-proof Strong Double-wall Borrosilicate Glass Tea (Sports Bottle) Made of ultra clear borosilicate glass (not plastic), unlike the plastic tumbler, this one is good for cold drink or hot drink. No worry of BPA or plastic taste Unique double wall structure keeps hot drink hot and cold drink cold. Removable stainless steel strainer keeps loose tea in bottle. Perfect to use in home, office or car. Dual-wall Glass allows for a comfortable grip temperature