Sustainability in Their Hands: Our new Nalgene Sustain sippy cups 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. For Your Everyday Adventures: This durable water bottle is ther pefect choice for school, camp, hikes, family road trips, and more Designed for Little Hands: Recessed grips on the side make these water bottles perfect for kids' hands Leakproof Guarantee: The leakproof closure is rubber-coated, secured with a valve, and the ergonomic mouthpiece is made of soft plastic Easy to Pack: The wide mouth makes the bottle easily attachable to a diaper bag, backpack or stroller with a carabiner