HydraPak 42mm Filter Cap vs Katadyn BeFree AC Water Filter (0.5L)
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 →New-for-2025 2-stage filter: 0.1 micron hollow fiber + removable activated carbon. 2L/min flow, 1000L capacity, improved taste.
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HydraPak 42mm Filter Cap vs Katadyn BeFree AC Water Filter (0.5L): which should you buy?
If saving weight is your priority, the HydraPak 42mm Filter Cap wins — at 57 g it is 15 g (21%) lighter than the Katadyn BeFree AC Water Filter (0.5L) (72 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.