Hyperlite Mountain Gear Southwest 55 Backpack vs Hyperlite Mountain Gear Unbound 40L
Weight and specs compared for 2026 — and which one to choose.
Robust ultralight pack with Dyneema Composite Hybrid fabric and two aluminum stays. Ideal for technical terrain and variable weather conditions.
Check price Full details →Ultralight 40L pack in woven Dyneema Composite Fabric with internal frame stays and hipbelt. Ideal for fast alpine and thru-hiking missions.
Check price Full details →Hyperlite Mountain Gear Southwest 55 Backpack vs Hyperlite Mountain Gear Unbound 40L: which should you buy?
If saving weight is your priority, the Hyperlite Mountain Gear Southwest 55 Backpack wins — at 850 g it is 3 g (0%) lighter than the Hyperlite Mountain Gear Unbound 40L (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.