Katadyn BeFree AC Bottle 0.5L vs MSR Guardian Purifier Pump
Weight and specs compared for 2026 — and which one to choose.
Ultralight collapsible water filter bottle with activated carbon. Removes tannins and improves taste. Fits running vests and ultralight daypacks
Full details →Military-grade water purifier removes viruses, bacteria and protozoa.
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Katadyn BeFree AC Bottle 0.5L vs MSR Guardian Purifier Pump: which should you buy?
If saving weight is your priority, the Katadyn BeFree AC Bottle 0.5L wins — at 72 g it is 418 g (85%) lighter than the MSR Guardian Purifier Pump (490 g). That said, the heavier option may justify the extra grams with more capacity, durability or comfort, so weigh the trade-off against how you'll use it.
See where both rank against everything else in this category on the lightest hygiene page, or browse the full gear weight database.