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Casio Pro Trek PRG-340 vs Flextail Zero Power 5k

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

Casio Pro Trek PRG-340 is the lighter option — 19 g lighter than the Flextail Zero Power 5k (22% less weight). If grams matter to you, that is the one to beat.
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Spec Casio Pro Trek PRG-340 Flextail Zero Power 5k
Weight 66 g · 0.066 kg · 0.15 lb 85 g · 0.085 kg · 0.19 lb
Brand Casio Flextail
Category Electronics Electronics
Casio Pro Trek PRG-340
66 g

Solar-powered outdoor watch with triple sensor.

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Flextail Zero Power 5k
85 g

Lightweight USB-C power bank with dual ports. At 85g, it's the lightest UL battery pack on the market.

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Casio Pro Trek PRG-340 vs Flextail Zero Power 5k: which should you buy?

If saving weight is your priority, the Casio Pro Trek PRG-340 wins — at 66 g it is 19 g (22%) lighter than the Flextail Zero Power 5k (85 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 electronics page, or browse the full gear weight database.

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