It's a no brainer - GSI H2JO! Hydration System

bought as a replacement for one I lost. It takes up no space, weighs very little, & makes a great cup of coffee. A few grains do get through the screen, but I usually steep the coffee 4 mins. then remove it & clean the screen & reinstall it on the bottle, let the grains settle & pour using it as a filter. Makes great coffee, a whole naglene bottle of coffee.

This review was written in the old system and had content requirements that are different than reviews written today.