Hyperlite Mountain Gear Unbound 55 vs ULA Catalyst
Weight and specs compared for 2026 — and which one to choose.
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...
Versatile 68L semi-frameless pack for loaded trips.
Building a pack? Add either one to your HikeLoad list, or drop its weight into the base weight calculator, and see what it does to your total weight.
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Hyperlite Mountain Gear Unbound 55 vs ULA Catalyst: which should you buy?
If saving weight is your priority, the Hyperlite Mountain Gear Unbound 55 wins — at 853 g it is 406 g (32%) lighter than the ULA Catalyst (1,259 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.