The LifeStraw Go Series Water Filter Tumbler keeps you hydrated with safe, great-tasting water – no matter where your day takes you. This 18oz stainless steel tumbler fits perfectly into your car’s cupholder, whether you’re commuting or running errands. The advanced 2-stage filter improves taste and protects against bacteria, parasites, and microplastics. Your purchase has impact: one product, one child, one year of safe water.