MSR TrailShot vs SteriPen Adventurer Opti

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

SteriPen Adventurer Opti is the lighter option — 51 g lighter than the MSR TrailShot (36% less weight). If grams matter to you, that is the one to beat.

Spec	MSR TrailShot	SteriPen Adventurer Opti
Weight	141 g · 0.141 kg · 0.31 lb	90 g · 0.090 kg · 0.20 lb
Brand	MSR	SteriPen
Category	Hygiene	Hygiene

MSR TrailShot

141 g

Pocket-sized squeezable water filter. Fast flow rate.

Full details →

SteriPen Adventurer Opti

90 g

UV water purifier. Purifies 1L in 90 seconds.

Full details →

MSR TrailShot vs SteriPen Adventurer Opti: which should you buy?

If saving weight is your priority, the SteriPen Adventurer Opti wins — at 90 g it is 51 g (36%) lighter than the MSR TrailShot (141 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

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