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It's easy to associate Amazon Prime Day with things like smart home gadgets and robot vacuums — but there's one product that always sells like hot cakes during the annual sale: the LifeStraw Personal Water Filter. Every year, these unique "straws" fly off the digital shelves and this year's Amazon Prime Day sale should be no different. 

Through the end of July 13, the LifeStraw Personal Water Filter is on sale for just $11.12, which is almost a third off its standard price of $30. If you're not one of the many who already have one (or four) of these stashed in your garage or camp kit, there's no better time than right now to fix that.

LifeStraws are portable filters that can make even some of the murkiest standing water drinkable. For backpackers and hikers, a LifeStraw can be an invaluable tool in dire situations.

The LifeStraw is a water filter shaped like a straw that allows you to drink right out of the nearest river or creek — like you're sipping from a big glass of water. 

Like many water filters, it removes 99.9% of both bacteria and parasites, including E. coli, Giardia, Salmonella, and many others. But unlike other water filters, the LifeStraw also removes 99.9% of microplastics. Amid growing concerns about the effects of microplastics on human health, this is a huge benefit. 

Getting this for $11.12 is the definition of a great deal — and you have until the end of July 13 to score one for yourself. 

Yes, the LifeStraw absolutely works. During our own review, we took it on both camping and backpacking trips and found it to be a reliable method for accessing potable water. We used it to drink out of a stream and to filter water we gathered and stored in a reusable water bottle, and found no issues (be it getting sick or the water tasting off). 

There is no single-use for a LifeStraw. Having reliable access to water that's safe to drink is incredible vital, and the LifeStraw is one of the best and most affordable ways to assure that access. Here's who could benefit: 

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