Katadyn BeFree AC Filter vs Montbell U.L. Shell Mittens
Weight and specs compared for 2026 — and which one to choose.
Hollow-fiber filter in a collapsible soft flask with optional activated carbon for taste improvement. Fast 2L/min flow rate and ultralight for on-the-go hydrati...
Full details →Ultra-thin ultra-light shell mittens. Minimal weight option for backup hand protection.
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Katadyn BeFree AC Filter vs Montbell U.L. Shell Mittens: which should you buy?
If saving weight is your priority, the Montbell U.L. Shell Mittens wins — at 9 g it is 56 g (86%) lighter than the Katadyn BeFree AC Filter (65 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 miscellaneous page, or browse the full gear weight database.