Orange and Green travel size carbonating bottles with special hermetic sealing caps. Each bottle has a half-liter capacity (about 16 fl. oz.) and may be used for up to 2 years. Each SodaStream bottle replaces over 2500 bottles and cans from store-bought drinks.BPA-Free! SodaStream"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. SodaStream bottles are BPA-free and do not use any polycarbonate materials. Also, SodaStream does not use any materials in the production process that can produce phthalates or PCBs.