Each Sustain bottle is created from resin powered by next-generation recycling technology that transforms plastic destined for landfills into high-performance, BPA/BPS, and phthalate-free bottles. The Nalgene Sustain product line is made from 50% certified recycled content, further offsetting the use of fossil fuels and lowering greenhouse gas emissions. For those who prefer a roomy bottle with a smaller opening, Nalgene offers a narrow-mouth loop-top bottle. It offers all the same advantages as the wide-mouth, with a top that minimizes the chance of spills and a cap that never gets lost.