OKO H2O Level-2 Advanced Filtration Water Bottle

I bought this for international travel. First used it on a trip to the Dominican Republic. The 1000 ml size is quite large and bulky. However, it does hold quite a bit of water, so less refilling. You fill the bottle first and it filters as you suck on it. I didn't find it difficult it suck so it works well. My Dominican friend saw me put tap water in it and yelled, "nooooo". I tried to translate how it filters bacteria and microbes, but they didn't understand. So, I told them we'd see in the morning who was correct. I woke up fine with no sickness so I can assure everyone that it worked for me. I did extensive research on which filtering water bottle to purchase and selected this Oko bottle based on it's 2 stage filtering and long lasting filter. It can filter up to 580 times. I ended up leaving the bottle with my Dominican friend because they have a water shortage and lack potable water. He reports he is doing well and no sickness.

Purchased this to use while on vacation as we normally never drink the "local" water and opt to purchase bottled water while traveling (in the states or in japan/asia. I thought of bringing a Lifestraw but the convenience of having a "bottle" was desired and the Lifestraw would be overkill for states with drinkable water. So far we have used this a few times whilst on vacation and it has worked great….removed all the chlorine taste/smell and we simply used it in the room from the sink….we also used it to fill an empty water bottle to take with us while sight seeing and shopping. Overall this is a great and needed item to travel with; it's so light so packing it was a breeze and we simply dried it out upon our return before the next trip. Extra filters are also readily available and the price of these bottles is very affordable so we are planning to give these as gifts to friends who travel….great addition!!!

Works as designed/advertised for back country safe water. For comparison I've used the "Bota" nesting filter in a soft-sided Nalgene bottle for almost ten years with not one ill effect, but Bota is now out of business. I've now used the Oko on a five-day backpacking trip getting all of my water out of small lakes and tarns, one of which was used by dogs and humans for swimming. I'm pleased to report no gut issues after two weeks. If you have experience with the Bota, the Oko takes less effort to force the water out and it's every bit as easy to use. Using both hands is still the way to go but if the bottle is full, one hand can fairly easily force a few swallows out. Up next is discovering how long before the bottle splits, I'm sure it will eventually, and how long until the filter is clogged enough that two hands isn't enough to squeeze the water out. There is no way to back-flush the element so when it's clogged, it's pretty much lived its life.The Oko is just as effective as the Bota at eliminating bad flavor in the water. From every water source I got water, it tasted spring-pure. Check out the company's web site for an impressive demonstration video on its filtering effectiveness.I've also used the Sawyer squeeze-bag/filter device and to be honest, I'm not a fan of it. I do like the ability to back-flush the Sawyer but the bags come apart at the neck seam fairly easily when squeezed too hard, which is easy to do when you're in a hurry. Also, the bags are almost impossible to fill by dunking in still water, they simply collapse on themselves. If I have to carry a "dirty" bottle simply to fill the bag, I'll choose to carry the Oko. When you've got flowing water, especially little pour-overs, the bags are simple to fill. The Oko is easily to fill in any water unless it's really shallow.One word of caution, when empty the bottle is quite top-heavy so take care when setting it down on an open slope. With nothing to stop it, it will be gone in a flash. Thankfully I learned that one with a Gatoraid bottle.

After a year or so of use the filtration system seems great. If that were the only consideration, I would give the water bottle 5 stars. However, every so often I go to take a swig and water will gush over my face and down the front of my shirt. This happens because the rubber seal is unreliable and to get good flow you need to tip up the bottle, suck on the nozzle, and squeeze the bottle at the same time (he he). The pressure you're creating in the bottle as you're trying to drink plus the seal failure can be pretty explosive. Mine is upright all the time and I imagine that if you were using the bottle in circumstances where the bottle was not upright all the time, the seal failure could be even more annoying. The rubber seal is also really awkward to put back in place so it works correctly. An unfolded paper clip is my go to tool.So 3 stars: I like the filtration and the concept, and I'm sticking with it, but I'm sick of the leaks and wouldn't buy again.

Received my OKO H20 Level-2 Advanced Filtration Water Bottle today. After rinsing the bottle and the filter several times, I filled it with tap water, and drank almost perfect tasting water. There was almost no after taste from the filter. I am comparing this with another brand of filtration system which I tried last week. This last one continues to deliver a bitter taste, and I have discontinued using it. I agree with other reviewers that the carabinier which comes with the OKO is weak, so is where it is hooked to. It will not survive serious outdoor activities. The mouthpiece needs to be redesigned also to include a tight cover against dust. I have not encountered any leak but my bottle is new. I am satisfied with OKO and I recommend it if you are as fussy about your drinking water as I am.

As I started to feel bad after drinking water from it, I decided to test it as per many videos on YouTube and I see the water is not filtered , the product entire is made in China not USA.

Bottle works as intended, however i feel like it is way overpriced for what you get

Amazing bottle! The flow is a bit slow but that is because of the multiple layers of the filter.

Nice design and functionality. It's a bit unstable if empty.

Tip - squeeze the bottle as well as sucking to increase volume of water