Sea to Summit DryLite Towel M 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 DryLite Towel M (25% less weight). If grams matter to you, that is the one to beat.

Spec	Sea to Summit DryLite Towel M	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 DryLite Towel M

120 g

Ultralight microfibre towel. Dries 10x faster than cotton.

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SteriPen Adventurer Opti

90 g

UV water purifier. Purifies 1L in 90 seconds.

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Sea to Summit DryLite Towel M 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 DryLite Towel M (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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