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HydraPak 42mm Filter Cap vs LifeStraw Peak Series Collapsible Squeeze 650ml

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

HydraPak 42mm Filter Cap is the lighter option — 43 g lighter than the LifeStraw Peak Series Collapsible Squeeze 650ml (43% less weight). If grams matter to you, that is the one to beat.
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Spec HydraPak 42mm Filter Cap LifeStraw Peak Series Collapsible Squeeze 650ml
Weight 57 g · 0.057 kg · 0.13 lb 100 g · 0.100 kg · 0.22 lb
Brand HydraPak LifeStraw
Category Hygiene Hygiene
HydraPak 42mm Filter Cap
57 g

Lightweight fast-flow filter cap that threads onto 42mm bottles, removing bacteria and cysts for hiking and travel.

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LifeStraw Peak Series Collapsible Squeeze 650ml
100 g

Ultralight collapsible water filter bottle at only 3.5 ounces.

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HydraPak 42mm Filter Cap vs LifeStraw Peak Series Collapsible Squeeze 650ml: which should you buy?

If saving weight is your priority, the HydraPak 42mm Filter Cap wins — at 57 g it is 43 g (43%) lighter than the LifeStraw Peak Series Collapsible Squeeze 650ml (100 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.

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