HydraPak 42mm Filter Cap vs Katadyn BeFree 1L
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.
Lightweight collapsible water filter bottle. 1L per minute.
Building a pack? Add either one to your HikeLoad list, or drop its weight into the base weight calculator, and see what it does to your total weight.
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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.