Nalgene Tritan Silo 48oz Wide Mouth Water Bottle with Screw on Lid - When you need greater capacity, the Silo is the ticket. It is leak proof and easily slides into standard packs and backpack side pockets. It is very durable and has the standard 63mm Loop-Top cap. The neck configuration works with most major water purifiers and filters. Sustain bottles are made using ISCC certified mass balance with material derived from 50% waste plastic. Each bottle is created from resin powered by next generation recycling technology that transforms plastic destined for landfills into high-performance bottles. Made in the USA BPA free Dishwasher safe