LifeStraw Go Series Tumbler 18 oz

I've been using this tumbler during my daily hikes and the slim design actually fits perfectly in my backpack's side pocket. The membrane filter works great on questionable tap water I find at trailhead rest stops.

My office water cooler always seemed a bit off, so I've been filling this from the tap instead—the slim 18 oz shape fits my car cup holder perfectly. After a month of daily use, the water tastes noticeably cleaner and I love that it filters out microplastics.

I was skeptical about drinking straight from the tap again, but this tumbler's membrane microfilter handles everything from E. coli to microplastics, and the slim design actually fits in my car's cup holder. Ice and all, the water tastes clean and fresh every time.