A slim shape and fortified cap make On-The-Fly ideal for care-free storage in work bags, gym bags, backpacks and cup holders. Opens easily for convenient one-hand refreshment on the fly. Locks to prevent spills. Made in our new Sustain material derived from 50% waste plastic (using ISCC certified mass balance), further offsetting the use of fossil fuels and lowering greenhouse gas emissions. Our new Nalgene Sustain product line is made from Tritan Renew, 50% certified recycled content further offsetting the use of fossil fuels and lowering greenhouse gas emissions. With the OTF’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 Its slim shape and leak-proof cap make it ideal for workbags, gym bags, and backpacks alike – without worry that it’s going to give your stuff a soak. Free of BPA, BPS and phthalates, opening accommodates most water filters; marked with milliliters and ounces for easy measurement