HydraPak 42mm Filter Cap vs Nalgene Wide Mouth 1L

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

HydraPak 42mm Filter Cap is the lighter option — 121 g lighter than the Nalgene Wide Mouth 1L (68% less weight). If grams matter to you, that is the one to beat.

Spec	HydraPak 42mm Filter Cap	Nalgene Wide Mouth 1L
Weight	57 g · 0.057 kg · 0.13 lb	178 g · 0.178 kg · 0.39 lb
Brand	HydraPak	Nalgene
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.

Check price Full details →

Nalgene Wide Mouth 1L

178 g

Classic 1L Tritan water bottle. Leakproof and BPA-free.

Full details →

HydraPak 42mm Filter Cap vs Nalgene Wide Mouth 1L: which should you buy?

If saving weight is your priority, the HydraPak 42mm Filter Cap wins — at 57 g it is 121 g (68%) lighter than the Nalgene Wide Mouth 1L (178 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.

More hygiene comparisons

HydraPak 42mm Filter Cap vs PackTowl UltraLite Face Towel HydraPak 42mm Filter Cap vs CNOC Vecto 3L Water Container HydraPak 42mm Filter Cap vs Sawyer Mini Water Filter HydraPak 42mm Filter Cap vs Katadyn BeFree 1L HydraPak 42mm Filter Cap vs Sawyer Squeeze Filter HydraPak 42mm Filter Cap vs Sea to Summit Trek and Travel Liquid Hand Wash