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Gregory Optic 48 vs Osprey Kestrel 48

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

Gregory Optic 48 is the lighter option — 130 g lighter than the Osprey Kestrel 48 (9% less weight). If grams matter to you, that is the one to beat.
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Spec Gregory Optic 48 Osprey Kestrel 48
Weight 1,370 g · 1.370 kg · 3.02 lb 1,500 g · 1.500 kg · 3.31 lb
Brand Gregory Osprey
Category Backpack Backpack
Gregory Optic 48
1,370 g

Lightweight 48L trail pack with suspended mesh back panel.

See it in your base weight → Full details →
Osprey Kestrel 48
1,500 g

Adjustable 48L pack with AirScape back panel.

See it in your base weight → Full details →

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 Kestrel 48: which should you buy?

If saving weight is your priority, the Gregory Optic 48 wins — at 1,370 g it is 130 g (9%) lighter than the Osprey Kestrel 48 (1,500 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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