Sustainability in Your Hands: Our new Nalgene Sustain water bottles are made with material derived from 50% Plastic Waste (using ISCC certified mass balance).This material is powered by next generation recycling technology that transforms plastic into high performance BPA/BPS free bottles for everyday (and safe!) use. Use With One Hand: With the On the Fly water bottle s convenient, one-handed cap design, you don t have to drop everything to take a sip. For Your Everyday Adventures: Take your Nalgene bottle to the gym, office, camping, exploring and everywhere in between Leak-Proof Design: Its slim shape and leak-proof cap make easy to carry in your work bag, gym bag, or backpack without spilling Safe & Easy to Use: Free of BPA, BPS and phthalates, opening accommodates most water filters; marked with milliliters and ounces for easy measurement.