If you're an outdoor enthusiast or just someone who likes to be prepared, LifeStraw's personal water filters are on sale for under $10 during Amazon Prime Day. These handy gadgets can turn sketchy water sources into something drinkable—whether you're hiking, bikepacking, or stocking up for emergencies.

Editor’s Note: Clean water isn’t always a given when you're off the grid or dealing with a crisis. A cheap, reliable filter like this could be a game-changer for adventurers and preppers alike—especially at this price. It’s one of those small purchases that might actually save your skin someday.