Which SteriPEN should you buy?

I was confused as to how the SteriPENS differed from each other, so I made this table. Enjoy.

Essentially the biggest factors you will need to decide between are size, weight and price.

SteriPens are a helpful tool for those looking to keep their drinking water clean and healthy and for those looking to travel or backpack with lightweight gear.

ModelCostWeightLengthAverage Amazon Rating
Freedom $$$74 grams 13 cm 4.0
Ultra$$140 grams18.6cm 4.3
Adventure Opti$$108 grams15.5cm4.4
Classic$156 grams 19.3cm 4.2
Emergency $156 grams 19.3cm 4.3
Emergency $$$156 grams 19.3cm 4.2
Defender156 grams 19.3cm n/a

Size Comparison:

So the table above discusses the size of each unit, but to put things into perspective visually – here is the Classic, Ultra, Adventure Opti and Freedom are side by side.

Bunch of Pens

Visual comparison of Classic, Ultra, Adventure Opti and Freedom Steripens.

Read Our Individual Reviews:

Some Notes:

  • None of the SteriPENs in this post filter out the sediment (dirt etc) which may be in the water you are purifying, but there are several options for per-filtering the water before purifying it with a SteriPEN.
  • As with any water purification method you choose, you may wish to bring along a backup process – in case your first method fails for whatever reason. If you do, water purification tablets are an excellent option as they are lightweight, small and cheap.

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