HydraPak 42mm Filter Cap vs LifeStraw Peak Series Solo Water Filter
Weight and specs compared for 2026 — and which one to choose.
Lightweight fast-flow filter cap that threads onto 42mm bottles, removing bacteria and cysts for hiking and travel.
Full details →0.2 micron microfilter, 3L/min flow, 2000L capacity. Screws onto 28mm bottles or use as straw. Removes 99.999999% bacteria.
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HydraPak 42mm Filter Cap vs LifeStraw Peak Series Solo Water Filter: which should you buy?
If saving weight is your priority, the LifeStraw Peak Series Solo Water Filter wins — at 48 g it is 9 g (16%) lighter than the HydraPak 42mm Filter Cap (57 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.