Grayl UltraPress Purifier vs MSR Guardian Purifier Pump
Weight and specs compared for 2026 — and which one to choose.
Press-style 16.9oz bottle purifier using electroadsorption and activated carbon; removes viruses, bacteria and protozoa.
Military-grade water purifier removes viruses, bacteria and protozoa.
Building a pack? Add either one to your HikeLoad list, or drop its weight into the base weight calculator, and see what it does to your total weight.
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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 354 g it is 136 g (28%) 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.