If you already have a case for your iPhone, then there's no sense in spending a bunch more on a waterproof case (which are few and far between). If you're just headed out on vacation or want to take some pool pictures, then grab a waterproof bag. They fit every version of iPhone, and you can get them for a lot less than a waterproof case.
Pro tip: Fill your waterproof bag with paper towel and submerge it in a sink full of water for around two hours. If the paper towel comes out dry, you're good to go. If not, send it back.
Note: Waterproof bags do not work with Touch ID. The biometric scanner in Touch ID needs to be able to read your fingerprint and requires a special membrane that allows the fingerprint scan to work.
Protection to a 100 feet depth
JOTO universial waterproof pouch
JOTO's universal waterproof case comes in eight colors, and it does exactly what it's supposed to do: keep your iPhone dry. With an IPX8 rating, JOTO's bag is water, snow, and dust-proof, and able to keep water out to a depth of 100 feet. It's perfect for scuba divers, vacationers, and anyone who wants to take some awesome underwater photos/video.
Simple closure for quick access
Mpow universal waterproof case
Mpow's bag is transparent on all sides, which makes it completely usable at all times, allowing you to take photos or play games while you're lounging in the pool. This bag will fit any version of iPhone and any other devices up to 6 inches diagonally. At the top of the bag is a simple snap-and-lock closure for quick access on the fly.
Colorful and stylish
FRiEQ waterproof phone bag
This universal waterproof case/bag is a stylish option in this department and features a handy lanyard, so you can hold onto your iPhone without having to hold on to your iPhone the whole time. You have your choice of light blue, black, or pink. Like all good waterproof bags, FRiEQ's has a window on both sides and is made from a touch-sensitive material that lets you continue to use your iPhone.
Strong locking bag
Kona waterproof phone bag
Kona's waterproof bag is a little more heavy duty than the others on this list, featuring a twist-to-lock closure. It's still touch-sensitive, and you can easily access your iPhone to take photos and video. This will fit all iPhones and any devices up to 6.3 inches diagonally, but if you have a thicker case, you'll have to remove it, since it's a tighter fit, width-wise.
3-for-1
Ace Teah waterproof case
Each bag is good to 100 feet deep and comes with a lanyard that can be easily detached. Ace Teah's bags will fit all iPhones, and it's important to note that these are not touch sensitive. Though you can still turn on your iPhone's camera, pop it into the bag, and use the volume buttons to take photos instead of the screen.
Lifetime warranty
Yosh waterproof case
Yosh's bag is for adults who want to be stylish. It come in a pastel palette of pink, orange, green, and yellow, as well as black and white. Yosh's bags feature a nice long lanyard, so you can have your iPhone on your wrist while you're splashing around, and Yosh provides a lifetime warranty, so if anything goes wrong, you can replace your bag.
Although a lot of the newer iPhones comes with an IP rating, making them somewhat water-resistant, older iPhones and other phones don't, making a waterproof bag perfect for a cheap and reliable way to keep your phone from getting water damaged!
Updated Spetember 2018: These waterproof bags are still the best of the best!
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