Grayl GeoPress vs HydraPak 42mm Filter Cap
Weight and specs compared for 2026 — and which one to choose.
Water purifier bottle at 450g. 710ml capacity with advanced filtration technology for pathogen and chemical removal.
Full details →Lightweight fast-flow filter cap that threads onto 42mm bottles, removing bacteria and cysts for hiking and travel.
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Grayl GeoPress vs HydraPak 42mm Filter Cap: which should you buy?
If saving weight is your priority, the HydraPak 42mm Filter Cap wins — at 57 g it is 393 g (87%) lighter than the Grayl GeoPress (450 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.