Gregory Optic 48 vs Osprey Exos Pro 55
Weight and specs compared for 2026 — and which one to choose.
Ultralight thru-hiking pack with ventilated AirSpeed back panel and removable lid, in 100D nylon ripstop. Nearly a pound lighter than the Exos 58.
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Gregory Optic 48 vs Osprey Exos Pro 55: which should you buy?
If saving weight is your priority, the Osprey Exos Pro 55 wins — at 862 g it is 508 g (37%) lighter than the Gregory Optic 48 (1,370 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.