Hyperlite Mountain Gear Southwest 40L vs Patagonia Ascensionist 35L

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

Patagonia Ascensionist 35L is the lighter option — 58 g lighter than the Hyperlite Mountain Gear Southwest 40L (7% less weight). If grams matter to you, that is the one to beat.

Spec	Hyperlite Mountain Gear Southwest 40L	Patagonia Ascensionist 35L
Weight	796 g · 0.796 kg · 1.75 lb	738 g · 0.738 kg · 1.63 lb
Brand	Hyperlite Mountain Gear	Patagonia
Category	Backpack	Backpack

Hyperlite Mountain Gear Southwest 40L

796 g

Ultralight 40L pack in Dyneema Composite Fabric with roll-top closure, hip belt pockets, and a structured back panel for comfort on demanding trails.

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Patagonia Ascensionist 35L

738 g

Lightweight climbing and hiking 35L pack.

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Hyperlite Mountain Gear Southwest 40L vs Patagonia Ascensionist 35L: which should you buy?

If saving weight is your priority, the Patagonia Ascensionist 35L wins — at 738 g it is 58 g (7%) lighter than the Hyperlite Mountain Gear Southwest 40L (796 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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