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HydraPak 42mm Filter Cap vs HydraPak UltraFlask Speed 600ml

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

Both weigh the same at 57 g, so choose on features, price and fit.
Spec HydraPak 42mm Filter Cap HydraPak UltraFlask Speed 600ml
Weight 57 g · 0.057 kg · 0.13 lb 57 g · 0.057 kg · 0.13 lb
Brand HydraPak HydraPak
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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HydraPak UltraFlask Speed 600ml
57 g

Soft-sided water bottle at 2 oz (57g) designed for running hydration vests and ultralight backpacking with collapsible design.

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HydraPak 42mm Filter Cap vs HydraPak UltraFlask Speed 600ml: which should you buy?

On weight these two are identical (57 g), so your decision comes down to features, fit and price. Check the full details and current price for each above.

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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