Gregory Focal 58 vs Zpacks Arc Blast 55L
Weight and specs compared for 2026 — and which one to choose.
Ventilated ultralight backpacking pack with a tensioned mesh backpanel, removable lid and roughly 16kg max recommended load.
Full details →Frameless Dyneema pack with excellent load carry for its weight.
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Gregory Focal 58 vs Zpacks Arc Blast 55L: which should you buy?
If saving weight is your priority, the Zpacks Arc Blast 55L wins — at 450 g it is 720 g (62%) lighter than the Gregory Focal 58 (1,170 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 backpack page, or browse the full gear weight database.