THIS IS *NOT* AN EXHAUSTION VALVE! u leave the cap on when ur not drinking thru the sip valve. this is a useful tool for anybody who has to mask for hours on end without compromising their ability to stay hydrated. this may seem excessive, but inhaling just a few breaths of an airborne virus can still get u sick, which can lead to u getting other ppl sick. most of us can’t afford to get sick and lose wages or develop new/further health problems, especially in THIS economy??? under THESE conditio
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