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Black Diamond Beta Light 45L vs Hyperlite Mountain Gear Prism 40L

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

No winner on weight yet. The recorded weights have not both been verified on the same basis. Size, included parts and single-item versus pair weights can differ. Check the linked sources before choosing a replacement.

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Spec Black Diamond Beta Light 45L Hyperlite Mountain Gear Prism 40L
Weight 890 g · 0.890 kg · 1.96 lb 827 g · 0.827 kg · 1.82 lb
Brand Black Diamond Hyperlite Mountain Gear
Category Backpack Backpack
Black Diamond Beta Light 45L
890 g

Lightweight 45-liter backpack designed for alpine and minimalist backpacking. Can be stripped to 650g by removing hip belt and internal stays.

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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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Black Diamond Beta Light 45L vs Hyperlite Mountain Gear Prism 40L: which should you buy?

The listed weights alone are not enough to choose between these products. Confirm the size, included parts and weight basis against each source; choose equipment for the function and fit you need.

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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