The ASVMART Water Bottles are conceptually designed for low weight and versatility. Polypropylene being naturally 100% food grade and safer than PET bottles is considered to be the safest choice for you and your family. These bottles are square and sleek taking considerably less space and the bottles are reusable & portable to store and fit in all major fridge and car compartments. Even after repeated use, these bottles will not emit any unpleasant odors. The cap closes firmly making the set of bottles completely leak-proof. The water stored in these bottles will remain clean and portable for a longer period of time if placed in a cool place. The high-quality plastic makes the set safe for use.