Casio Pro Trek PRG-300 vs Flextail Zero Power Bank
Weight and specs compared for 2026 — and which one to choose.
Lightweight outdoor GPS smartwatch with triple sensors, barometric pressure, and Tough Solar charging. Compact 56×47×12.6mm design.
Full details →Second lightest 10k battery at 5.1oz. Compact and efficient.
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Casio Pro Trek PRG-300 vs Flextail Zero Power Bank: which should you buy?
If saving weight is your priority, the Casio Pro Trek PRG-300 wins — at 57 g it is 87 g (60%) lighter than the Flextail Zero Power Bank (144 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.