2 x 0.5L Bottles Green and Red Smily Bottles Each 1/2 liter SodaStream bottle includes a special hermetic sealing cap and is BPA-free. SodaStream bottles are specially designed for high-pressure resistance and are the only bottles that can be used with SodaStream soda makers. Each bottle has a lifespan of 3 years and is not made with any polycarbonate materials or substances that produce phthalates or PCBs, ensuring an environmentally-friendly product. BPA-Free! Soda-Club's suppliers and subcontractors meet exacting specifications, so that millions of customers worldwide can enjoy a safe and superior product that is compliant with international standards for beverage quality