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Hyperlite Mountain Gear Prism 40L vs ULA Catalyst

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

Hyperlite Mountain Gear Prism 40L is the lighter option — 23 g lighter than the ULA Catalyst (3% less weight). If grams matter to you, that is the one to beat.
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Spec Hyperlite Mountain Gear Prism 40L ULA Catalyst
Weight 827 g · 0.827 kg · 1.82 lb 850 g · 0.850 kg · 1.87 lb
Brand Hyperlite Mountain Gear ULA
Category Backpack Backpack
Hyperlite Mountain Gear Prism 40L
827 g

Technical alpine pack in DCH150 Dyneema with crampon pouch, ice tool carry, and removable lid. Load capacity up to 22kg.

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ULA Catalyst
850 g

Versatile 68L semi-frameless pack for loaded trips.

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Hyperlite Mountain Gear Prism 40L vs ULA Catalyst: which should you buy?

If saving weight is your priority, the Hyperlite Mountain Gear Prism 40L wins — at 827 g it is 23 g (3%) lighter than the ULA Catalyst (850 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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