Lifestraw Solo Water Filter Size:One Size 600-grit side is used for

600-grit side is used for fine grinding

Thumbholes keep sleeves in place

2-piece set

Ridiculously tough 7075-T6 aluminum

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Lifestraw Solo Water Filter Size:One Size 600-grit side is used forLifeStraw Peak Series Solo Water Filter is an ultra lightweight (only 1. 7oz), compact (just 5. 1"), portable water filtration device that removes bacteria, parasites, microplastics, silt, sand, and cloudiness from drinking water. The standard 28mm threading on the filter allows it to be screwed onto most common water bottles. The one handed flip cap makes on the go filtration super easy and fast: fill up a 1L bottle in just 20 seconds. Great for