HydraPak 42mm Filter Cap vs Katadyn BeFree 1L

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

Katadyn BeFree 1L is the lighter option — 1 g lighter than the HydraPak 42mm Filter Cap (2% less weight). If grams matter to you, that is the one to beat.

Spec	HydraPak 42mm Filter Cap	Katadyn BeFree 1L
Weight	57 g · 0.057 kg · 0.13 lb	56 g · 0.056 kg · 0.12 lb
Brand	HydraPak	Katadyn
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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Katadyn BeFree 1L

56 g

Lightweight collapsible water filter bottle. 1L per minute.

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HydraPak 42mm Filter Cap vs Katadyn BeFree 1L: which should you buy?

If saving weight is your priority, the Katadyn BeFree 1L wins — at 56 g it is 1 g (2%) 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.

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