Hyperlite Mountain Gear Unbound 55 vs ULA Catalyst

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

ULA Catalyst is the lighter option — 3 g lighter than the Hyperlite Mountain Gear Unbound 55 (0% less weight). If grams matter to you, that is the one to beat.

Spec	Hyperlite Mountain Gear Unbound 55	ULA Catalyst
Weight	853 g · 0.853 kg · 1.88 lb	850 g · 0.850 kg · 1.87 lb
Brand	Hyperlite Mountain Gear	ULA
Category	Backpack	Backpack

Hyperlite Mountain Gear Unbound 55

853 g

Internal frame pack made from Dyneema Composite Hybrid fabric with 55L capacity. Designed for thru-hiking with weather-resistant roll-top lid and comfortable su...

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ULA Catalyst

850 g

Versatile 68L semi-frameless pack for loaded trips.

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Hyperlite Mountain Gear Unbound 55 vs ULA Catalyst: which should you buy?

If saving weight is your priority, the ULA Catalyst wins — at 850 g it is 3 g (0%) lighter than the Hyperlite Mountain Gear Unbound 55 (853 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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