HydraPak UltraFlask+ 500ml vs LifeStraw Peak Series Solo Water Filter
Weight and specs compared for 2026 — and which one to choose.
Compressible 500ml soft flask with an integrated fast-flow filter cap. Built for trail running, fastpacking and on-the-move filtering from hydration vests.
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 UltraFlask+ 500ml 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 17 g (26%) lighter than the HydraPak UltraFlask+ 500ml (65 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.