Katadyn BeFree AC Filter vs Mammut Aenergy TR 2 in 1 Shorts
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 →Lightweight shorts at 6.14oz with integrated base layer. Versatile design.
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Katadyn BeFree AC Filter vs Mammut Aenergy TR 2 in 1 Shorts: which should you buy?
If saving weight is your priority, the Katadyn BeFree AC Filter wins — at 65 g it is 109 g (63%) lighter than the Mammut Aenergy TR 2 in 1 Shorts (174 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.