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Ultralight Pack
~$239

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.

Approx. price
~$239
Capacity
40 L
Weight
0.62 lbs
Best For
Sub-10 lb base weight hikers who want a waterproof frameless pack
Buy from Zpacks

Price and availability on Zpacks’s site may differ.

Type
Ultralight Pack
Frame Type
Frameless
Capacity
40 L
Weight
0.62 lbs
Max Recommended Load
Not specified by the manufacturer
Torso Fit
See manufacturer sizing
Material
Ultra 100X with waterproof taped seams
Back Panel
Frameless
Warranty
Manufacturer warranty; terms not published
Raincover Included
No
Fits BV500 Bear Canister
No

Sizes Available

CapacityPriceWeight
30 L$239
40 Lthis pack$2390.62 lbs
50 L$239

Features

Hipbelt Pockets

Pros

  • 9.9 oz is the lightest hiking pack in this entire catalog, lighter even than the Cotopaxi Batac.
  • Ultra 100X with taped seams is genuinely waterproof, not merely treated.
  • Three volumes from 30 to 50 L on the same frameless design.
  • $239 is reasonable for a laminate pack from an established maker.
  • Zpacks has one of the longest DCF and Ultra track records in the segment.
  • Nothing rigid to break, bend or rattle.
  • 40 L is workable for a genuinely light multi-day kit.
  • Hipbelt pockets included despite the minimal design.

Cons

  • Frameless at 40 L demands a very low base weight to carry tolerably.
  • No published maximum load figure.
  • Ultra 100X is the thinnest of the Ultra family and abrades at fold lines.
  • No adjustable torso.
  • Difficult and expensive to repair in the field.
  • Sub-10 oz construction leaves no margin for rough handling.
  • Bear canisters do not fit sensibly in a frameless 40 L pack.
  • Warranty terms are not published in the way major brands publish them.

Common Questions

Related backpacks

More from Zpacks
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~$279
Ultralight Pack

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
Zpacks Arc Haul Ultra 60
~$399
Ultralight Pack

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.

60 L1.34 lbsVentilated Arc FrameVentilated back

Weight

1.32 lbs

Capacity

60 L

Frame

Internal Frame

Also in 40 L / 50 L / 70 L

Best for: Gram-counters who refuse to give up back ventilation
Zpacks Arc Zip Ultra 62
~$449
Ultralight Pack

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
🎒
~$240
Ultralight Pack

Pa'lante Packs

Pa'lante Packs V2

The Pa'lante V2 is the lightest pack in this catalog at 18.6 oz, and the clearest expression of the frameless ultralight philosophy: no frame, no stays, no lid, and a bottom pocket instead of a brain. It only works for hikers whose base weight is low enough that a frame is genuinely unnecessary.

37 L1.16 lbs210D UHMWPE Gridstop

Weight

1.16 lbs

Capacity

37 L

Frame

Frameless

Best for: Sub-10 lb base weight thru-hikers and fastpackers
🎒
~$235
Ultralight Pack

LiteAF builds to order in ECOPAK, a recycled laminate that is waterproof like Ultra but made from post-consumer polyester. At 13 oz for 45 L of total volume it is one of the lightest packs in this catalog, and custom sizing is included in the price.

45 L0.81 lbsECOPAK EPLX200 recycled laminate

Weight

0.81 lbs

Capacity

45 L

Frame

Frameless

Best for: Hikers wanting a custom-fitted frameless pack in a recycled waterproof fabric
🎒
~$245
Ultralight Pack

Mountain Laurel Designs

Mountain Laurel Designs Exodus 55

The Exodus is Mountain Laurel Designs' 55 L frameless pack, offered in a choice of UltraGrid or Ultra X fabrics which is why the price runs from $245 to $325. At 1 lb 2 oz for 58 L of measured volume it has one of the best weight-to-volume ratios here.

58 L1.13 lbsUltraGrid 200D or Ultra X 200/100D

Weight

1.13 lbs

Capacity

58 L

Frame

Frameless

Best for: Experienced ultralight hikers wanting maximum volume at minimum weight