Bottles, PET, square, with screw cap, VWR®. Square PET media bottles that are designed for packaging, storing, or transporting powder and liquid samples. EB Sterilisation Sterility Assurance Level (SAL) of 10⁻⁶ (ISO 11137) VWR® square PET media bottles are manufactured in a Class 100 000 cleanroom environment. Manufactured under EN ISO