← Gear database

Gregory Zulu 65 vs Outdoor Vitals CS40 Ultra

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

Outdoor Vitals CS40 Ultra is the lighter option — 915 g lighter than the Gregory Zulu 65 (54% less weight). If grams matter to you, that is the one to beat.
shopping_cart Check today's price on Amazon
Spec Gregory Zulu 65 Outdoor Vitals CS40 Ultra
Weight 1,680 g · 1.680 kg · 3.70 lb 765 g · 0.765 kg · 1.69 lb
Brand Gregory Outdoor Vitals
Category Backpack Backpack
Gregory Zulu 65
1,680 g

Ventilated 65L backpacking pack ideal for warm conditions.

Full details →
Outdoor Vitals CS40 Ultra
765 g

Ultralight 40L backpack built for ultralight hiking and thru-hiking. Features innovative weight-saving construction that carries 20x its weight.

Full details →

HikeLoad is reader-supported. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Learn more.

Gregory Zulu 65 vs Outdoor Vitals CS40 Ultra: which should you buy?

If saving weight is your priority, the Outdoor Vitals CS40 Ultra wins — at 765 g it is 915 g (54%) lighter than the Gregory Zulu 65 (1,680 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.

More backpack comparisons

Gregory Zulu 65 vs Gossamer Gear Elixir 20 Daypack Gregory Zulu 65 vs Gossamer Gear Murmur 36 Hyperlight Backpack Gregory Zulu 65 vs Salomon ADV Skin 12 Gregory Zulu 65 vs Zpacks Nero Classic Ultra Backpack Gregory Zulu 65 vs Zpacks Nero Classic 50L Gregory Zulu 65 vs Zpacks Nero Classic Backpack