Atom Packs Pulse EP50 vs Hyperlite Mountain Gear Prism 40L
Weight and specs compared for 2026 — and which one to choose.
UK-made 50L ultralight thru-hiking pack with a carbon hooped frame and EcoPak fabric, carrying loads up to ~14kg comfortably.
Full details →Technical alpine pack in DCH150 Dyneema with crampon pouch, ice tool carry, and removable lid. Load capacity up to 22kg.
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Atom Packs Pulse EP50 vs Hyperlite Mountain Gear Prism 40L: which should you buy?
If saving weight is your priority, the Atom Packs Pulse EP50 wins — at 680 g it is 147 g (18%) lighter than the Hyperlite Mountain Gear Prism 40L (827 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.