Sea to Summit Wilderness Wash 100ml vs SteriPen Adventurer Opti

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

SteriPen Adventurer Opti is the lighter option — 30 g lighter than the Sea to Summit Wilderness Wash 100ml (25% less weight). If grams matter to you, that is the one to beat.

Spec	Sea to Summit Wilderness Wash 100ml	SteriPen Adventurer Opti
Weight	120 g · 0.120 kg · 0.26 lb	90 g · 0.090 kg · 0.20 lb
Brand	Sea to Summit	SteriPen
Category	Hygiene	Hygiene

Sea to Summit Wilderness Wash 100ml

120 g

Biodegradable all-purpose soap for use near waterways.

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SteriPen Adventurer Opti

90 g

UV water purifier. Purifies 1L in 90 seconds.

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Sea to Summit Wilderness Wash 100ml vs SteriPen Adventurer Opti: which should you buy?

If saving weight is your priority, the SteriPen Adventurer Opti wins — at 90 g it is 30 g (25%) lighter than the Sea to Summit Wilderness Wash 100ml (120 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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