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Hyperlite Mountain Gear Southwest 40L Backpack vs LiteAF ECOPAK 30L Curve Frameless

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

LiteAF ECOPAK 30L Curve Frameless is the lighter option — 473 g lighter than the Hyperlite Mountain Gear Southwest 40L Backpack (56% less weight). If grams matter to you, that is the one to beat.
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Spec Hyperlite Mountain Gear Southwest 40L Backpack LiteAF ECOPAK 30L Curve Frameless
Weight 841 g · 0.841 kg · 1.85 lb 368 g · 0.368 kg · 0.81 lb
Brand Hyperlite Mountain Gear LiteAF
Category Backpack Backpack
Hyperlite Mountain Gear Southwest 40L Backpack
841 g

Fully waterproof Dyneema Composite Hybrid pack with aluminum stays and foam back panel. Built for off-trail use in harsh conditions. 29.7 oz.

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LiteAF ECOPAK 30L Curve Frameless
368 g

Ultralight frameless backpack made from 100% recycled polyester fabric; fully waterproof and durable

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Hyperlite Mountain Gear Southwest 40L Backpack vs LiteAF ECOPAK 30L Curve Frameless: which should you buy?

If saving weight is your priority, the LiteAF ECOPAK 30L Curve Frameless wins — at 368 g it is 473 g (56%) lighter than the Hyperlite Mountain Gear Southwest 40L Backpack (841 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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