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Osprey Eja Pro 55 vs Osprey Sirrus 36

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

Osprey Eja Pro 55 is the lighter option — 344 g lighter than the Osprey Sirrus 36 (28% less weight). If grams matter to you, that is the one to beat.
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Spec Osprey Eja Pro 55 Osprey Sirrus 36
Weight 876 g · 0.876 kg · 1.93 lb 1,220 g · 1.220 kg · 2.69 lb
Brand Osprey Osprey
Category Backpack Backpack
Osprey Eja Pro 55
876 g

Women's sub-1kg thru-hiking pack built from UHMWPE fabric with an AirSpeed suspended mesh back and removable top lid.

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Osprey Sirrus 36
1,220 g

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

Full details →

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Osprey Eja Pro 55 vs Osprey Sirrus 36: which should you buy?

If saving weight is your priority, the Osprey Eja Pro 55 wins — at 876 g it is 344 g (28%) lighter than the Osprey Sirrus 36 (1,220 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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