Hyperlite Mountain Gear Southwest 55 vs Osprey Atmos AG 65
Weight and specs compared for 2026 — and which one to choose.
Ultralight Dyneema 55L pack for serious gram-counters.
Full details →Full-featured 65L pack with Anti-Gravity suspension. Ideal for extended trips.
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Hyperlite Mountain Gear Southwest 55 vs Osprey Atmos AG 65: which should you buy?
If saving weight is your priority, the Hyperlite Mountain Gear Southwest 55 wins — at 680 g it is 1,500 g (69%) lighter than the Osprey Atmos AG 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.