HydraPak 42mm Filter Cap vs PackTowl UltraLite Face Towel

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

PackTowl UltraLite Face Towel is the lighter option — 29 g lighter than the HydraPak 42mm Filter Cap (51% less weight). If grams matter to you, that is the one to beat.

Spec	HydraPak 42mm Filter Cap	PackTowl UltraLite Face Towel
Weight	57 g · 0.057 kg · 0.13 lb	28 g · 0.028 kg · 0.06 lb
Brand	HydraPak	PackTowl
Category	Hygiene	Hygiene

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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PackTowl UltraLite Face Towel

28 g

Featherlight 30×60cm microfibre travel towel.

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HydraPak 42mm Filter Cap vs PackTowl UltraLite Face Towel: which should you buy?

If saving weight is your priority, the PackTowl UltraLite Face Towel wins — at 28 g it is 29 g (51%) 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.

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