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Hyperlite Mountain Gear Southwest 55 vs Zpacks Arc Haul Ultra 60L Backpack

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

Zpacks Arc Haul Ultra 60L Backpack is the lighter option — 56 g lighter than the Hyperlite Mountain Gear Southwest 55 (8% less weight). If grams matter to you, that is the one to beat.
Spec Hyperlite Mountain Gear Southwest 55 Zpacks Arc Haul Ultra 60L Backpack
Weight 680 g · 0.680 kg · 1.50 lb 624 g · 0.624 kg · 1.38 lb
Brand Hyperlite Mountain Gear Zpacks
Category Backpack Backpack
Hyperlite Mountain Gear Southwest 55
680 g

Ultralight Dyneema 55L pack for serious gram-counters.

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Zpacks Arc Haul Ultra 60L Backpack
624 g

Ultralight 60L thru-hiking pack with DCF fabric and arc carbon fiber frame for load transfer. Weight varies by configuration.

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Hyperlite Mountain Gear Southwest 55 vs Zpacks Arc Haul Ultra 60L Backpack: which should you buy?

If saving weight is your priority, the Zpacks Arc Haul Ultra 60L Backpack wins — at 624 g it is 56 g (8%) lighter than the Hyperlite Mountain Gear Southwest 55 (680 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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