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HydraPak 42mm Filter Cap vs MSR TrailShot
Weight and specs compared for 2026 — and which one to choose.
HydraPak 42mm Filter Cap is the lighter option — 84 g lighter than the MSR TrailShot (60% less weight). If grams matter to you, that is the one to beat.
HydraPak 42mm Filter Cap
57 g
Lightweight fast-flow filter cap that threads onto 42mm bottles, removing bacteria and cysts for hiking and travel.
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HydraPak 42mm Filter Cap vs MSR TrailShot: which should you buy?
If saving weight is your priority, the HydraPak 42mm Filter Cap wins — at 57 g it is 84 g (60%) lighter than the MSR TrailShot (141 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.
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