Hyperlite Mountain Gear Southwest 55 Backpack vs ULA Catalyst

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

Both weigh the same at 850 g, so choose on features, price and fit.

Spec	Hyperlite Mountain Gear Southwest 55 Backpack	ULA Catalyst
Weight	850 g · 0.850 kg · 1.87 lb	850 g · 0.850 kg · 1.87 lb
Brand	Hyperlite Mountain Gear	ULA
Category	Backpack	Backpack

Hyperlite Mountain Gear Southwest 55 Backpack

850 g

Robust ultralight pack with Dyneema Composite Hybrid fabric and two aluminum stays. Ideal for technical terrain and variable weather conditions.

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ULA Catalyst

850 g

Versatile 68L semi-frameless pack for loaded trips.

Full details →

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

On weight these two are identical (850 g), so your decision comes down to features, fit and price. Check the full details and current price for each above.

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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