Hyperlite Mountain Gear Unbound 40L vs Hyperlite Mountain Gear Unbound 55

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

Both weigh the same at 853 g, so choose on features, price and fit.

Spec	Hyperlite Mountain Gear Unbound 40L	Hyperlite Mountain Gear Unbound 55
Weight	853 g · 0.853 kg · 1.88 lb	853 g · 0.853 kg · 1.88 lb
Brand	Hyperlite Mountain Gear	Hyperlite Mountain Gear
Category	Backpack	Backpack

Hyperlite Mountain Gear Unbound 40L

853 g

Ultralight 40L pack in woven Dyneema Composite Fabric with internal frame stays and hipbelt. Ideal for fast alpine and thru-hiking missions.

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Hyperlite Mountain Gear Unbound 55

853 g

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 40L vs Hyperlite Mountain Gear Unbound 55: which should you buy?

On weight these two are identical (853 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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