Hyperlite Mountain Gear Unbound 55 vs Six Moon Designs Fusion 55
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...
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Hyperlite Mountain Gear Unbound 55 vs Six Moon Designs Fusion 55: which should you buy?
If saving weight is your priority, the Six Moon Designs Fusion 55 wins — at 622 g it is 231 g (27%) 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.