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Grayl UltraPress Purifier vs MSR Guardian Purifier Pump

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

Grayl UltraPress Purifier is the lighter option — 181 g lighter than the MSR Guardian Purifier Pump (37% less weight). If grams matter to you, that is the one to beat.
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Spec Grayl UltraPress Purifier MSR Guardian Purifier Pump
Weight 309 g · 0.309 kg · 0.68 lb 490 g · 0.490 kg · 1.08 lb
Brand Grayl MSR
Category Hygiene Hygiene
Grayl UltraPress Purifier
309 g

Press-style 16.9oz bottle purifier using electroadsorption and activated carbon; removes viruses, bacteria and protozoa.

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MSR Guardian Purifier Pump
490 g

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

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

If saving weight is your priority, the Grayl UltraPress Purifier wins — at 309 g it is 181 g (37%) 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.

More hygiene comparisons