The flow rate is awesome especially if you don't add the charcoal element. I hope the flow rate continues at this rate. I have tried other water filters and they all seem to lose their flow rate after a week or so. Yes, I have swished and back flushed.

Works Perfectly

This is a lightweight, foldable product. It filters water effectively. There is no insulation but there wasn't supposed to be so this is not a surprise. It is exactly what is advertised and it's a high quality product. anybody can use this product. It is an excellent means of filling up at a stream and not worrying about getting sick. I like the loop this has so you can secure it to your bag.

Portable And Light

I used to use a life straw for fly fishing but it is often hard to drink out of and if I leave the water, I have nothing to drink. This lets me grab water and then be able to walk away or back to the car and still have something to drink. It folds down small and fits in my fly fishing pack very easily. So far I’m a big fan!

The Filter!

As packable as it gets. Water tastes better than with other filters I used. It is also very good quality and it seems very durable! I wish they had a clear color option.

Very Easy Too Use

After a short time of use, this filter seems to be the easiest to push water through and has the highest flow rate of any I’ve tried. I haven’t yet tried it with the charcoal filter insert but I will next time because the bottle has a strong plastic taste. At least early on. Not sure if that will dissipate.

Great Taste And Flow, Okay Durability.

The durability of the product is not great. The flow and taste of water through the filter is perfect. For the price it's very solid, just wish the seems of the soft flask were tougher as mine broke with squeezing.

A Must For Mountain Runners

I got this as I prep for my mountain ultras this summer. I won't go on long runs in the mountains without it. It gives me the peace to know that I will always have access to water (as long as their is a steam, etc)

Befree Ac 0.5l Microfilter Bottle

[This review was collected as part of a promotion.] New Review: ** I went back in and changed review as this had a micro tear after using it for a week while on my huge biking and hiking trip in Europe. I was in Italy bikepacking and hiking and absolutely needed a water filter and this failed. I reached out and never was able to get it replaced unfortunately. Really disappointed that this did not hold up especially as I needed it. I wish I could give it a 4 1/2 stars as my challenges with it are very small. Previous review: Overall this is a great Microfilter Water Bottle - for those that are complaining that it isn't big enough it is a 0.5L Microfilter Bottle so it is made to be smaller. For me this is the perfect bottle for bikepacking, day hikes, and camping. I am someone that likes to pack light especially when bikepacking you can't have a lot of added weight. I love that I can put a carabiner on the top and clip it to the outside of my backpack - one of its best features. The flow rate is the best on the market. I have a few other water filtration systems that are awkward to squeeze and have a pretty slow flow rate. This one is great and quick. The reason I marked it down one star is due to the lid being hard to open. Its not the end of the world but would like to see it be easier - it hurt my fingers popping it open. It did not ease up with use. Further, it is hard to get the last bit of water out. I tried rolling up the bottle and there was some slightly left. To me it is not the biggest deal but if I was really thirsty I would be frustrated. The system is super easy to clean and tells you right on the bottle how to do it. I love the material, color, and call outs of the liters and how to clean it. Its very durable. I have used it over and over and have not run into any issues. I will be bikepacking / backpacking in Europe this summer and will be bringing this and using it non stop. Its a great brand and they have done a great job of creating a really really solid water filtration system. Its simple and worth it. I might end up getting more of these for friends and family that spend a lot of time out hiking and biking.

Perfect For Backpacking

Used this on a four day backpacking trip and worked great!

Buy This Thing

Picked one of these up for longer trail running adventures. Highly highly recommend no issues so far after 100+ miles fits perfect in a Salomon vest and I’m sure other vests too!

Quick, Low Profile And Convenient

I clip this filter onto the strap of my backpack and it makes it super convenient. Instead of filtering into a separate bottle (which I will also do) I love being able to drink directly out of this. Just a great size and the hook is an awesome feature.

I live off of these puppies, I love being able to move light and quick through the mountains and these let me fill up at any water source as I run.

Super Fast And Light

great product with a good price point. as fast as you would expect from katadyn and hollow fiber technology. feels durable as well.

Great Filter From A Great Company

[This review was collected as part of a promotion.] Small, lightweight and easy to use. If you don’t want complicated filters requiring a bunch steps to use the this is the filter for you. Pens and drops always have you worried if you added enough or held it in there long enough to clean your water. Easy to use and clean for all users beginners or experts. I like the ability to roll it up so it’s not taking up a bunch of space. It doesn’t feel cheaply made either. Quality parts and construction. Worked amazing in Alaska just scoop and drink! no big bottles or containers, just roll it up and put it in your pocket.

Really Well Thought Out All-in-one Piece

My partner and I take this on longer hikes and trail runs when we might need a refill on the trail. I love how small and compact this flask-filter combo can get, and how it can disappear into a pack/vest. The filter also has a great flow rate, even when I just squeeze it out to refill a bottle. If you don't close the nozzle cap, the flow rate is so good it'll leak out. The filer is also really easy to clean and the filter has the added benefit of removing the plastic-y taste of the soft flask. I wish that Katadyn would make this product modular so the filter could be swapped out into a bigger, gravity reservoir. It would also be great if the hard plastic could be cut down a bit as it can get uncomfortable when I stash it empty in a tighter pocket on my vest. These are minor issues overall! This would be a great product for someone who wants a filter-flask combo and wants to be able to refill on the trail with a no-frills, no-hastle system.