Filters are the most popular method of ensuring water collected in the outdoors is completely safe to drink, and there are a lot of choices from pump filters to gravity filters from respected brands such as MSR and Katadyn, as well as newer brands such as HydroBlu. The lightest option could be chemical treatment though, for example Micropur tablets weigh virtually nothing, the only compromise compared with a filter is they don't remove particulate matter, but if you expect clear water sources such as running rivers then they could be the best option.

  • Peak Series Gravity Water Purifier System 8L Peak Series Gravity Water Purifier System 8L
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    LifeStraw

    Peak Series Gravity Water Purifier System 8L

    Weighs
    721g
    Weighs:
    721g (ex bag)
    Capacity:
    >3.0L

    We're working out what we think - we'll add our view here!  LifeStraw says:  The LifeStraw Peak Series Gravity Water Purifier is a portable, high-capacity water purification system that removes viruses, in addition to bacteria, parasites an…

    £184.99
    RRP: £199.99 | Save: £15.00
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  • Lifesystems Chlorine Dioxide Droplets Lifesystems Chlorine Dioxide Droplets
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    Lifesystems

    Chlorine Dioxide Droplets

    Weighs
    80g
    Weighs:
    80g

    Chemical water purification drops.  Lifesystems says:  These water purification drops kill bacteria, viruses and cysts in water including Giardia and Cryptosporidium. Chlorine dioxide is the safest and most effective form of chemical water.…

    £9.99
    RRP: £9.99
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  • Sawyer International Mini Filter Sawyer International Mini Filter

    Sawyer International

    Mini Filter

    Weighs
    97g
    Weighs:
    97g (complete kit)

    The Sawyer Mini Filter is extremely light and can be used to filter water in a variety of ways including sucking straight from the source. Backflushing is straight forward and easy. Sawyer says:  “A lifetime of water at hand.” Our mo…

    £39.99
    RRP: £44.99 | Save: £5.00
  • Pure Clear Collapsible Squeeze Water Filter Bottle Pure Clear Collapsible Squeeze Water Filter Bottle
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    Pure Clear

    Collapsible Squeeze Water Filter Bottle - Bottle

    Weighs
    56g
    Weighs:
    56g

    A Collapsible Water Filter that can filter 99.9999% of bacteria AND viruses. Pure Clear says:  Tired of carrying around your water bottle when it is empty or having to squeeze it back into your bag when there is no more room? Pure Clear®...

    £29.99
    RRP: £29.99
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  • Katadyn BeFree Water Filtration System 0.6L Katadyn BeFree Water Filtration System 0.6L
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    Katadyn

    BeFree Water Filtration System 0.6L

    Weighs
    59g
    Eco Initiatives:
    BPA Free
    Weighs:
    59g

    UOG TOP PICK - Katadyn's BeFree Filter - We've singled out Katadyn's BeFree Filter as one of our top recommendations because it's very lightweight, compact, collapsible and has a fast flowrate. It's a simple design but it works really well. It's idea…

    £47.99
    RRP: £49.99 | Save: £2.00
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  • CamelBak Eddy+ Filtered By Lifestraw 1L Bottle CamelBak Eddy+ Filtered By Lifestraw 1L Bottle

    CamelBak

    Eddy+ Filtered By Lifestraw 1L Bottle

    Weighs
    270g
    Weighs:
    270g
    Capacity:
    1000ml

    A sleek and stylish travel water bottle incorporating a LifeStraw water filter that’s been redesigned for an enhanced performance that now incorporates more recycled materials. CamelBak says:  Eddy® + filtered by LifeStraw® takes …

    £49.99
    RRP: £49.99
  • MSR Miniworks/Waterworks EX Ceramic Element
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    MSR

    Miniworks/Waterworks EX Ceramic Element

    Weighs
    107g
    Weighs:
    107g

    The MSR MiniWorks/WaterWorks Ceramic Element alows you to revamp your filter or provides increased flow rate for an older model. MSR says Replacement ceramic filter element for both MiniWorks and WaterWorks microfilters provides increased flow rates…

    £52.99
    RRP: £62.99 | Save: £10.00
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  • MSR Hyperflow MicroFilter Replacement Cartridge MSR Hyperflow MicroFilter Replacement Cartridge
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    MSR

    Hyperflow MicroFilter Replacement Cartridge

    Weighs
    70g
    Weighs:
    70g

    The HyperFlow utilizes the latest Hollow Fiber Technology in a package so small and so easy to use it will change the way you travel in the backcountry. MSR says: Restore flow rates in your HyperFlow Microfilter with fresh, new Hollow Fiber media...

    £58.99
    RRP: £69.99 | Save: £11.00
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  • Currently out of stock
    Steripen Fits-All Filter

    Steripen

    Fits-All Filter

    Weighs
    65g
    Weighs:
    65g

    The SteriPEN Fits-All Filter effectively removes particulates from water with the use of a durable 4x4 micron screen. Its unique design, featuring the filter cup and funnel fit, offers flexibility to filter water into bottles with a wide range o…

    £29.99
    RRP: £29.99
  • Currently out of stock
    Sawyer International Micro Squeeze Water Filtration System Sawyer International Micro Squeeze Water Filtration System

    Sawyer International

    Micro Squeeze Water Filtration System

    Weighs
    78g
    Weighs:
    78g

    UOG TOP PICK -The Micro Squeeze Water Filtration System is an adaptable and super light weight system to keep you hydrated with peace of mind and tummy whatever your water source- its an easy top pick for us! Sawyer says Enjoy clean and safe drinki…

    £46.99
    RRP: £49.99 | Save: £3.00
  • HydroBlu Versa Flow Lightweight Water Filter Package HydroBlu Versa Flow Lightweight Water Filter Package
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    HydroBlu

    Versa Flow Lightweight Water Filter Package

    Weighs
    188g
    Weighs:
    188g (set)

    UOG TOP PICK - The Versa Flow is a highly effective, versatile and lightweight filter. It weighs just 54g and can screw onto bottles, be used as a straw, be used for in-line and gravity filters to clean water and keep you safe- We've singled out …

    £37.99
    RRP: £37.99
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  • LifeStraw GO 2 Stage Replacement Filter GO 2 Stage Replacement Filter
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    LifeStraw

    GO 2 Stage Replacement Filter

    Weighs
    45g
    Weighs:
    45g

    Replacement water filter Compatible with all LifeStraw Go 2-Stage Water Bottles and LifeStraw Universal. Lifestraw says Protects against bacteria, parasites, microplastics, chlorine, organic chemical matter, dirt, sand, and cloudiness; improves taste…

    £23.99
    RRP: £23.99
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  • HydroBlu MUV Nomad Water Filter HydroBlu MUV Nomad Water Filter
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    HydroBlu

    MUV Nomad Water Filter

    Weighs
    230g
    Weighs:
    230g
    Capacity:
    700ml

    The MUV Nomad gives you a handy and practical bottle design with a serious water filter inside. The MUV filter is a compact Nanalum filter capable of dealing with heavy metals, chemicals, bacteria, viruses and sediment. HydroBlu says Virus and bacte…

    £40.99
    RRP: £40.99
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  • Katadyn BeFree Gravity Water Filtration System 10L Katadyn BeFree Gravity Water Filtration System 10L
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    Katadyn

    BeFree Gravity Water Filtration System 10L

    Weighs
    284g
    Eco Initiatives:
    BPA Free
    Capacity:
    >3.0L
    Weighs:
    284g

    Lightweight, hands-free water filtration for larger groups. Katadyn says: The sleek, foldable Katadyn BeFree Gravity 6L filter system uses gravity to get the freshest, cleanest water you can trust. The heart of the BeFree Gravity 6L is the EZ-Clean..…

    £149.99
    RRP: £159.99 | Save: £10.00
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  • MSR Trail Base Water Filter Kit MSR Trail Base Water Filter Kit

    MSR

    Trail Base Water Filter Kit

    Weighs
    472g
    Weighs:
    472g (set)

    The MSR Trail Base Water Filter Kits can be easily transformed from a trail filter into a gravity system which makes it perfect for adventurers who explore the backcountry in multiple ways. MSR says To meet the needs of multi-activity backcountry..…

    £122.99
    RRP: £144.99 | Save: £22.00
  • MSR Trailshot Microfilter Replacement Cartridge
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    MSR

    Trailshot Microfilter Replacement Cartridge

    Weighs
    28g
    Weighs:
    28g (set)

    A handy replacement part for the Trailshot filter, if you ever manage to wear yours out. MSR says: Refreshes the flow rates of your Trailshot Microfilter. This kit contains a replacement filter cartridge for the TrailShot filter, as well as the small…

    £39.99
    RRP: £41.99 | Save: £2.00
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  • Katadyn Hiker Pro Transparent Water Filter Katadyn Hiker Pro Transparent Water Filter
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    Katadyn

    Hiker Pro Transparent Water Filter

    Weighs
    264g
    Weighs:
    264g (excluding bag)

    The Hiker Pro is a durable water filter that is easy to setup and use. It filters out bacteria and protozoa resulting in great water quality. Versatile attachments and points mean it can be used with other hydration kits such as bladders easily. Kat…

    £99.99
    RRP: £104.99 | Save: £5.00
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  • LifeStraw Peak Series Collapsible Squeeze Bottle 1L LifeStraw Peak Series Collapsible Squeeze Bottle 1L

    LifeStraw

    Peak Series Collapsible Squeeze Bottle 1L

    Weighs
    108g
    Weighs:
    108g
    Hydration Capacity:
    0.5-1.0L

    Fill up and go water filtration is the simplest and quickest way to stay hydrated in the back county. LifeStraw says:  It's time to stop carrying around a bag of plastic parts and multiple water bottles. LifeStraw’s Peak compact squeeze..…

    £49.99
    RRP: £49.99
  • Currently out of stock
    Quickdraw Filter Quickdraw Filter

    Platypus

    Quickdraw Filter

    Weighs
    81g
    Weighs:
    81g

    We're working out what we think - we'll add our view here!  Platypus says:  Improve your backcountry filtering experience with the do-it-all QuickDraw Filter. Hollow fiber technology allows the QuickDraw to filter water fast (3L/m) while...

    £45.99
    RRP: £49.99 | Save: £4.00