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Gregory Optic 48 vs Osprey Exos 48

Weight and specs compared for 2026 — and which one to choose.

Osprey Exos 48 is the lighter option — 90 g lighter than the Gregory Optic 48 (7% less weight). If grams matter to you, that is the one to beat.
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Spec Gregory Optic 48 Osprey Exos 48
Weight 1,370 g · 1.370 kg · 3.02 lb 1,280 g · 1.280 kg · 2.82 lb
Brand Gregory Osprey
Category Backpack Backpack
Gregory Optic 48
1,370 g

Lightweight 48L trail pack with suspended mesh back panel.

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Osprey Exos 48
1,280 g

Lightweight 48L thru-hiking pack with excellent ventilation.

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Building a pack? Add either one to your HikeLoad list, or drop its weight into the base weight calculator, and see what it does to your total weight.

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Gregory Optic 48 vs Osprey Exos 48: which should you buy?

If saving weight is your priority, the Osprey Exos 48 wins — at 1,280 g it is 90 g (7%) 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.

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