This 1000ml Tritan bottle, in black/yellow, from iDrink, reference ID2131, is a reusable bottle made of transparent copolyester. Tritan is a BPA-free, transparent, and virtually unbreakable copolyester that does not retain odors or stains and is resistant to both heat and cold, and is dishwasher safe. The contrast between black and yellow is a more visible combination than the pastel shades in the same range. It is a preferred option for those looking for a large bottle with bolder, more eye-catching colors.