Hyperlite Mountain Gear Unbound 40L vs Osprey Exos Pro 55
Weight and specs compared for 2026 — and which one to choose.
Ultralight 40L pack in woven Dyneema Composite Fabric with internal frame stays and hipbelt. Ideal for fast alpine and thru-hiking missions.
Check price Full details →Ultralight thru-hiking pack with ventilated AirSpeed back panel and removable lid, in 100D nylon ripstop. Nearly a pound lighter than the Exos 58.
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Hyperlite Mountain Gear Unbound 40L vs Osprey Exos Pro 55: which should you buy?
If saving weight is your priority, the Hyperlite Mountain Gear Unbound 40L wins — at 853 g it is 9 g (1%) lighter than the Osprey Exos Pro 55 (862 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.