Hyperlite Mountain Gear 3400.
Dyneema Composite Fabric construction delivers ultralight durability that refuses to compromise.
The Verdict.
Gavler Meta-Score
“The HMG 3400 is the pack that ultralight thru-hikers dream about and traditional backpackers scoff at — until they pick one up. 1.9 pounds for a 55-liter pack is not a typo, and DCF is not a fragile fabric. It's waterproof, abrasion-resistant, and dimensionally stable in ways that nylon can only aspire to. The tradeoff is real: no frame, minimal padding, and a price that makes you wince. But for the hiker who measures pack weight in grams, nothing else exists.”
The Gavler Verdict
Precision Engineering
Dyneema Composite Fabric
DCF is a non-woven laminate with ~10x the abrasion resistance of equivalent-weight nylon. Waterproof, tear-resistant, and dimensionally stable without coatings that wear off.
Waterproof Roll-Top
Fully waterproof roll-top closure eliminates the need for a pack cover or internal dry bags — a weight and complexity saving that compounds on rainy thru-hikes.
Frameless with Aluminum Stay
A removable aluminum stay and foam backpanel give just enough support for 25-30 lb loads; beyond that, it's pushing the design envelope.
Technical Specifications
The Scoreboard
Ultralight community treats it as gospel. Traditional backpackers note the lack of frame support limits comfort above 25 lbs, and the price is steep for a pack without bells and whistles.
Cast Your Vote
Do you think Hyperlite Mountain Gear 3400 deserves the #3 spot in Best Hiking Backpacks?
Best Price Availability.
Prices checked April 2026
Global Critique
“Dyneema Composite Fabric is roughly 10x more abrasion-resistant than equivalent-weight nylon, and the 3400 Windrider is the pack that made that practical for backpackers. It's as close to a waterproof pack as you can buy off the rack.”
“For thru-hikers who've worn out two nylon packs, the HMG 3400 is the obvious next purchase. It's not the most comfortable pack at 30 pounds, but it's the lightest pack that survives 2,000-mile seasons intact.”
“The roll-top closure means you stop thinking about rain. For PCT and AT hikers who see weeks of weather, that alone justifies the premium over a conventional pack with a cover.”
“If you're counting grams, the 3400 is the endgame frameless pack — and DCF's long-term durability makes the $395 sting a little less after 800 miles.”
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