Gossamer Gear Mirage 40L Pack ALUULA vs Osprey Exos Pro 55 Backpack
Weight and specs compared for 2026 — and which one to choose.
Lightest framed 40L backpack, 19.4oz, ALUULA Graflyte V52 ultra-lightweight fabric
Full details →Ultralight thru-hiking backpack at 937g (S/M) with 55L capacity and comfortable suspension for loads up to 35 lbs.
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Gossamer Gear Mirage 40L Pack ALUULA vs Osprey Exos Pro 55 Backpack: which should you buy?
If saving weight is your priority, the Gossamer Gear Mirage 40L Pack ALUULA wins — at 549 g it is 388 g (41%) lighter than the Osprey Exos Pro 55 Backpack (937 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.