Store aqueous solutions with durable and autoclavable Thermo Scientific™ Nalgene™ Square Polycarbonate Bottles with Closure. These ultra clear bottles provide extra clarity, helping you to easily identify the contents inside. Featuring an easy to handle square design, these bottles are also ideal for short-term storage of media. This square design saves valuable space in the freezer to 130 degrees C (275 degrees F). The molded-in graduations make dispensing easy. Bottles include leakproof polypropylene (PP) screw top caps. In order to ensure leakproof performance, use only the caps provided. Remove cap or completely disengage threads before autoclaving. Repeated autoclaving will shorten bottle life.