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Gregory Optic 48 vs Hyperlite Mountain Gear Prism 40L

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

Hyperlite Mountain Gear Prism 40L is the lighter option — 543 g lighter than the Gregory Optic 48 (40% less weight). If grams matter to you, that is the one to beat.
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Spec Gregory Optic 48 Hyperlite Mountain Gear Prism 40L
Weight 1,370 g · 1.370 kg · 3.02 lb 827 g · 0.827 kg · 1.82 lb
Brand Gregory Hyperlite Mountain Gear
Category Backpack Backpack
Gregory Optic 48
1,370 g

Lightweight 48L trail pack with suspended mesh back panel.

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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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Gregory Optic 48 vs Hyperlite Mountain Gear Prism 40L: which should you buy?

If saving weight is your priority, the Hyperlite Mountain Gear Prism 40L wins — at 827 g it is 543 g (40%) lighter than the Gregory Optic 48 (1,370 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.

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