Flextail Zero Power 5k vs Polar Grit X
Weight and specs compared for 2026 — and which one to choose.
Lightweight USB-C power bank with dual ports. At 85g, it's the lightest UL battery pack on the market.
Full details →Multisport GPS smartwatch weighing 64g with wristband. Rugged design with navigation, long battery life, and military-grade durability.
Full details →HikeLoad is reader-supported. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Learn more.
Flextail Zero Power 5k vs Polar Grit X: which should you buy?
If saving weight is your priority, the Polar Grit X wins — at 64 g it is 21 g (25%) 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.