Osprey Exos 58 Backpack vs Osprey Sirrus 36

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

Osprey Sirrus 36 is the lighter option — 56 g lighter than the Osprey Exos 58 Backpack (4% less weight). If grams matter to you, that is the one to beat.

Spec	Osprey Exos 58 Backpack	Osprey Sirrus 36
Weight	1,276 g · 1.276 kg · 2.81 lb	1,220 g · 1.220 kg · 2.69 lb
Brand	Osprey	Osprey
Category	Backpack	Backpack

Osprey Exos 58 Backpack

1,276 g

Lightweight ventilated backpack with AirSpeed suspended mesh back panel. Floating top lid, large front pocket. Great all-day comfort for summer hikes.

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Osprey Sirrus 36

1,220 g

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

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Osprey Exos 58 Backpack 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 56 g (4%) lighter than the Osprey Exos 58 Backpack (1,276 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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