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Grayl GeoPress vs MSR Guardian Purifier Pump

Weight and specs compared for 2026 — and which one to choose.

Grayl GeoPress is the lighter option — 40 g lighter than the MSR Guardian Purifier Pump (8% less weight). If grams matter to you, that is the one to beat.
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Spec Grayl GeoPress MSR Guardian Purifier Pump
Weight 450 g · 0.450 kg · 0.99 lb 490 g · 0.490 kg · 1.08 lb
as listed
Brand Grayl MSR
Category Hygiene Hygiene
Grayl GeoPress
450 g

Water purifier bottle at 450g. 710ml capacity with advanced filtration technology for pathogen and chemical removal.

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MSR Guardian Purifier Pump
490 g

Military-grade water purifier removes viruses, bacteria and protozoa.

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Grayl GeoPress vs MSR Guardian Purifier Pump: which should you buy?

If saving weight is your priority, the Grayl GeoPress wins — at 450 g it is 40 g (8%) 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.

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