Guaranteed leakproof, this REI wide-mouth water bottle in fun transparent colors is a must-have for camping or campus Made of Eastman Tritan copolyester, the bottle is completely BPA-free and is dishwasher safe top rack only. Tritan copolyester provides excellent impact resistance and is suitable for both warm and cold beverages. Wide-mouth design is easy to fill, and the loop-top means youre less likely to lose the lid. Opening on the 16-oz. bottle is slightly smaller than typical wide-mouth openings and will not fit with some popular water filters. .