LifeStraw Mission gravity water filter (2 stars) V SteriPEN UV water filter (4 stars) REVIEW 

Most cyclists take a water filter system away with them and the choice of which one to get depends on the kind of cycle tourer you are. Do you want to be completely self sufficient in terms of your water consumption or are you looking for something that you will only use in an absolute emergency? How much bottled water are you willing to buy? How fussy are you drinking straight from mountain springs? How far into secluded areas are you likely to go?

We became a lot less fussy as our trip progressed and with this our ability to fight off some bugs and bacteria has probably increased too. (Although we really probably should purify every time!)

Before we left we decided to buy a LifeStraw Mission ($119.15) which works by filling a 5L dry bag with water, attaching it to a special microfilter (gets rid of all viruses and bacteria) via a long tube, hanging it off a tree and letting gravity do its work.


The idea behind this purchase was that we would be able to filter a large amount of water which we could use for drinking and cooking without having to suck or pump the water clean ourselves (as many other filters require). Simple! Once you get the system going you’re left to get on with other things; no further effort required apart from swapping the bottles every so often.

At first the filter worked really well (it improves after a few uses too) but to be honest, we rarely had to use it in South East Asia as we were always buying bottled water. There were a couple of days in Cambodia and Thailand (where we were getting through 8-9L a day) when we found ourselves off the beaten track and needed to filter from a lake or river.

We used it slightly more in China when we were more adventurous in terms of our route and were making a conscious effort to reduce our plastic consumption. But we were often so high and so remote that we simply collected and drank water straight from the mountain streams.

Most of the time the water we were collecting was either very clear or had gone through some kind of pre filter to at least get rid of debris and dirt (e.g. In village wells and water collection points) but wasn’t necessarily treated against nasty bacteria and other waterborne infections. 

With this in mind we bought a handheld UV Sterilisation Pen (SteriPEN Ultra $99.99) and had it shipped to Chengdu. 

We’re currently carrying both the LifeStraw and the SteriPEN…

Why did we only give the LifeStraw a 2 star review?


  1. It’s not very robust. One morning I pulled out the filter and found that the dirty water (red) tap was completely twisted until it was torn and thus completely useless. No idea how this happened but it made us realise how fragile the filter is – not ideal for two travellers covering 80km a day…Due to its simple design, the filter still worked without the red tap but only when one of us sat there holding our finger over the hole. A week later Paddy whittled a simple bung from a stick, not ideal but it works ok and we can again leave the system filtering while we set up camp or relax.
  2. The filter is fairly bulky (measuring over a foot in length even when packed) and isn’t necessarily built to be kept in a bulging pannier, however careful you are when packing it.
  3. There isn’t always a suitable place to hang the bag which means one of you needs to hold the bag up on your shoulder – this gets tiring as a 1.5L of water takes around 4-5mins to filter! 
  4. It’s hard to rid the filter completely of water even if you hang it out overnight or blow air through the system while the red tap is open; This leads firstly, to water leaking into your pannier and secondly, to limescale building up on the inside of the feed tube. I don’t think this necessarily affects the filter too much but can’t be too good for it either?! 
  5. LifeStraw customer service is terrible and it seems it’s impossible to buy more pre-filters. At the bottom of the water bag is a pre-filter which stops all the larger debris before the water feeds through the micro-filter. After a number of uses you must clean and then finally replace your pre-filter. The system comes with a number of spares but it’s common to lose things when travelling, and ours disappeared somewhere near the Tibetan border. After 3 emails (which were ignored) and trawling their website as well as the internet in general we’ve concluded that it is impossible to buy more spare pre-filters…. We even contacted a number of LifeStraw UK distributors none of whom were able to help us. 

In conclusion, The LifeStraw Mission would be a good product for people who are camped somewhere fairly permanently, or at least not packing, unpacking and packing again multiple times a day like we are. It would also work better for people who have more storage space such as a camper-van or car.

It really is great to be able to leave the filter working while you set up camp and have something that works without any kind of power supply but you really need to have the time and space to pack the system away properly and unfortunately this means it just isn’t right for cycle tourers. We still use ours and we make it work but we wouldn’t buy it again. 

The SteriPEN on the other hand is brilliant and we use it FAR more than we have ever used the LifeStraw. Some cyclists have complained about the pen needing to be re-charged but we’ve always been in a position to be able to re-charge it when needed. It’s probably not completely waterproof no but as with all our other electrical gadgets, we protect it by keeping it a waterproof pannier. 

Other cyclists online have complained about their steriPEN braking but ours has been fine.

Of course some would say that the downside of a UV filter is that you can’t be sure you’ve decontaminated the ‘rim’ of the bottle… But if you think that most of the time you’ll be able to get clear water and just need a filter to kill the nasties then consider getting a UV pen instead. They are lightweight, compact, long-lasting and very quick. Just make sure you have a permanent water bottle with a wide enough top to use it correctly.

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