Katadyn BeFree AC Water Filter vs Pieps Micro BT

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

Katadyn BeFree AC Water Filter is the lighter option — 110 g lighter than the Pieps Micro BT (63% less weight). If grams matter to you, that is the one to beat.

Spec	Katadyn BeFree AC Water Filter	Pieps Micro BT
Weight	65 g · 0.065 kg · 0.14 lb	175 g · 0.175 kg · 0.39 lb
Brand	Katadyn	Pieps
Category	Safety	Safety

Katadyn BeFree AC Water Filter

65 g

0.1-micron hollow fiber filter integrated into a collapsible soft flask. 1,000L lifespan, fast flow rate. New AC version adds activated carbon filtration for im...

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Pieps Micro BT

175 g

Digital avalanche transceiver for winter mountain travel.

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Katadyn BeFree AC Water Filter vs Pieps Micro BT: which should you buy?

If saving weight is your priority, the Katadyn BeFree AC Water Filter wins — at 65 g it is 110 g (63%) lighter than the Pieps Micro BT (175 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 safety page, or browse the full gear weight database.

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