Should I worry about the Ultra fabric delamination reports?

Early generations of Ultra fabric had documented delamination reports, and Zpacks has since revised the laminate — recent-production packs report much better. The history still follows the brand on Reddit, and the 2-year warranty is thin next to ULA's and Osprey's lifetime coverage, so buy current production and keep receipts.

Does the arc ventilation actually work?

Yes — the tensioned mesh holds a real airflow gap off your back, and sweat reports drop dramatically versus foam-back cottage rivals; it is the only true ventilation in the sub-1.5-lb class. The catch is setup: the arc takes fiddling to tension correctly, and a mis-set arc pokes the lumbar.

How does torso sizing work?

The frame height is user-adjustable, which effectively customizes torso length — rare in the cottage world and a real advantage over the fixed sizes on ULA, HMG, and Durston packs. It removes most of the direct-order sizing gamble.

Can I run a hydration bladder?

There is no hydration sleeve — the design assumes bottle-only hydration in the side pockets. If a bladder is non-negotiable for you, this is the wrong pack.

How much load can 21.7 ounces of pack really carry?

Repeated long-trail reviews put it at 35-40 lbs carried shockingly well for the weight, thanks to the carbon arc frame. One packing note: the curved frame reduces usable volume and makes tall bear canisters ride oddly, so plan canister trips around a vertical fit.

Ultralight Pack

~$399

Zpacks

Zpacks Arc Haul Ultra 60

Name: Zpacks Arc Haul Ultra 60
Brand: Zpacks
Price: 399 USD
Availability: InStock

The Arc Haul Ultra 60 is Zpacks' engineering statement: a 21.7-ounce pack whose carbon arc frame tensions a mesh panel off your back — the only true ventilation in the sub-1.5-lb class. Backpacker magazine named it the best ultralight pack of 2026.

Approx. price

~$399

Capacity

60 L

Weight

1.32 lbs

Best For

Gram-counters who refuse to give up back ventilation

Buy from Zpacks →

Price and availability on Zpacks’s site may differ.

Specifications

What do these specs mean? →

Type

Ultralight Pack

Frame Type

Internal Frame

Capacity

60 L

Weight

1.32 lbs

Max Recommended Load

40 lbs

Torso Fit

User-adjustable frame height

Material

Ultra 100X body with nylon mesh pockets

Back Panel

Curved carbon fibre stays with tensioned arc

Warranty

Zpacks 2-year on materials and workmanship

Raincover Included

Fits BV500 Bear Canister

Yes

Sizes Available

Capacity	Price	Weight
40 L	$399	—
50 L	$399	—
60 Lthis pack	$399	1.32 lbs
70 L	$399	—

Features

Adjustable TorsoVentilated BackHipbelt PocketsFits Bear Canister

Pros

✓The lightest framed, ventilated 60L pack money can buy — nothing else combines 21.7 oz with a real airflow gap.
✓Backpacker magazine's best ultralight pack of 2026, adding mainstream validation to years of thru-hiker use.
✓The tensioned arc genuinely works: sweat reports drop dramatically versus foam-back cottage rivals.
✓Ultra 100X fabric is waterproof and far more abrasion-resistant than the old DCF packs.
✓The user-adjustable frame height effectively customizes torso length — rare in the cottage world.
✓Carries 35-40 lbs shockingly well for its weight, per repeated long-trail reviews.
✓Modular add-on ecosystem (belt pouches, shoulder pockets, lumbar pads) lets owners spec it like a custom pack.
✓Zpacks' repair department keeps long-trail packs alive mid-hike with fast turnarounds.

Cons

✗Early Ultra-fabric generations had documented delamination reports; Zpacks revised the laminate, but the history follows the brand on Reddit.
✗$399 plus the add-ons most people want pushes real cost toward $475.
✗The arc frame takes fiddling to tension right, and a mis-set arc pokes the lumbar.
✗The 2-year warranty is thin next to ULA's and Osprey's lifetime coverage.
✗The curved frame reduces usable volume and makes tall canisters ride oddly.
✗No hydration sleeve — bottle-only hydration is assumed.
✗Mesh and edge trim wear faster than the body fabric; brush country is not its habitat.
✗The whole design rewards careful owners and punishes casual abuse — it's precision gear, not a rental mule.

Common Questions

Compare the Zpacks Arc Haul Ultra 60

vs Hyperlite Mountain Gear Unbound 40 vs Hyperlite Mountain Gear Junction 55 vs Hyperlite Mountain Gear Windrider 55

Related backpacks

Zpacks Arc Zip Ultra 62

The Arc Zip is the Arc Haul with front zip access, so the pack opens like a suitcase instead of only from the top. It keeps the tensioned carbon arc that lifts the pack off the back -- Zpacks' distinguishing feature -- at 23.9 oz for 62 L.

62 L1.49 lbsUltra fabric with waterproof taped seams

Weight

1.49 lbs

Capacity

62 L

Frame

Internal Frame

Best for: Thru-hikers wanting the Arc suspension plus full front access

View details

🎒

~$279

Ultralight Pack

Zpacks

Zpacks Nero Pro 40

The Nero Pro is the upgraded Nero: 11.1 oz against the Classic's 9.9, for a $40 premium. The extra weight buys a more robust build in the same frameless, waterproof format across the same 30 to 50 L range.

40 L0.69 lbsUltra fabric with waterproof taped seams

Weight

0.69 lbs

Capacity

40 L

Frame

Frameless

Also in 30 L / 50 L

Best for: Frameless hikers wanting more durability than the Nero Classic offers

View details

🎒

~$239

Ultralight Pack

Zpacks

Zpacks Nero Classic 40

The Nero is Zpacks' frameless pack and at 9.9 oz the lightest framed-or-otherwise hiking pack in this catalog. Ultra 100X with taped seams makes it genuinely waterproof at a weight where most packs are barely water-resistant.

40 L0.62 lbsUltra 100X with waterproof taped seams

Weight

0.62 lbs

Capacity

40 L

Frame

Frameless

Also in 30 L / 50 L

Best for: Sub-10 lb base weight hikers who want a waterproof frameless pack

View details

~$399

Ultralight Pack

Hyperlite Mountain Gear

Hyperlite Mountain Gear Windrider 55

The Windrider is the Southwest with a large mesh front pocket in place of solid Dyneema, so wet gear can drain and dry. The 2025 overhaul moved the line to Dyneema Woven Composite and widened the shoulder straps.

55 L1.83 lbsDyneema Woven Composite with mesh front pocket

Weight

1.83 lbs

Capacity

55 L

Frame

Internal Frame

Also in 40 L / 70 L

Best for: Thru-hikers who want external stowage that drains

View details

~$399

Ultralight Pack

Hyperlite Mountain Gear

Hyperlite Mountain Gear Junction 55

The Junction sits between the Southwest and Windrider: a hybrid front pocket that is part solid Dyneema and part mesh, aiming to combine the Southwest's durability with the Windrider's drainage. Same 2025 fabric overhaul as the rest of the line.

55 L1.83 lbsDyneema Woven Composite with hybrid front pocket

Weight

1.83 lbs

Capacity

55 L

Frame

Internal Frame

Also in 40 L

Best for: Hikers who want a compromise between drainage and abrasion resistance

View details

~$405

Ultralight Pack

Hyperlite Mountain Gear

Hyperlite Mountain Gear Unbound 40

4.8(4)

The Unbound 40 is HMG's fast-and-light pack for dialed kits, with a stretch front pocket and bottom pocket aimed at hikers who move all day and camp minimally. At 40 liters it suits sub-10-lb base weights and shorter resupply intervals.

40 L1.72 lbsFast & Light

Weight

2.16 lbs

Capacity

40 L

Frame

Internal Frame

Also in 55 L

Best for: Dialed ultralighters with sub-10-lb base weights and frequent resupplies

View details

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