Casio Pro Trek PRG-300 vs Flextail Zero Power 5k
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 →Lightweight USB-C power bank with dual ports. At 85g, it's the lightest UL battery pack on the market.
Full details →HikeLoad is reader-supported. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Learn more.
Casio Pro Trek PRG-300 vs Flextail Zero Power 5k: which should you buy?
If saving weight is your priority, the Casio Pro Trek PRG-300 wins — at 57 g it is 28 g (33%) 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.