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Gregory Baltoro 65 vs Osprey Sirrus 36

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

Osprey Sirrus 36 is the lighter option — 960 g lighter than the Gregory Baltoro 65 (44% less weight). If grams matter to you, that is the one to beat.
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Spec Gregory Baltoro 65 Osprey Sirrus 36
Weight 2,180 g · 2.180 kg · 4.81 lb 1,220 g · 1.220 kg · 2.69 lb
Brand Gregory Osprey
Category Backpack Backpack
Gregory Baltoro 65
2,180 g

Premium 65L pack with Response A3 suspension for heavy loads.

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Osprey Sirrus 36
1,220 g

Women's ventilated 36L pack with AirSpeed back panel.

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Gregory Baltoro 65 vs Osprey Sirrus 36: which should you buy?

If saving weight is your priority, the Osprey Sirrus 36 wins — at 1,220 g it is 960 g (44%) lighter than the Gregory Baltoro 65 (2,180 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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