ULA Equipment
ULA Circuit
The Circuit is the thru-hiking pack — hand-made in Logan, Utah by ULA Equipment and a perennial #1 in Halfway Anywhere's PCT gear survey. Its 68 liters of total volume, bombproof Robic fabric, and 35 lb carry make it the default recommendation for first thru-hikes. An Ultra-fabric version is sold at a premium.
Price and availability on ULA Equipment’s site may differ.
Specifications
What do these specs mean? →Features
Pros
- ✓Has topped the Halfway Anywhere PCT gear survey for years — no pack has more verified thru-hiking miles behind its reputation.
- ✓Owners routinely report 3,000-5,000 trail miles before meaningful wear; the 400d Robic build is the UL durability benchmark.
- ✓The 68L total volume (bag plus huge pockets) swallows a BV500 plus a week of food, which smaller UL packs can't.
- ✓Carries its full 35 lb rating honestly — the hoop-and-stay frame outperforms most packs in its weight class.
- ✓The giant mesh front pocket and dual oversized hipbelt pockets define the category's organization standard.
- ✓Hand-made in Utah with a service team famous for repairs, spare parts, and straight answers.
- ✓The roll-top plus Y-strap handles bear canisters, foam pads, and packrafts without drama.
- ✓Resale value is exceptional — used Circuits sell within hours on UL trade forums.
Cons
- ✗The foam back panel has zero ventilation; expect a soaked shirt on humid climbs.
- ✗Fixed torso sizing means no adjustment range — measure carefully before ordering.
- ✗The utilitarian look (and famously loud color options) is a running joke even among loyalists.
- ✗At 2.33 lbs it's now heavier than newer rivals like the Kakwa 55 that match its carry.
- ✗No lid and minimal internal organization — everything lives in stuff sacks or the main tube.
- ✗Direct-order only in the US; you can't try one on in a store.
- ✗Lead times stretch during thru-hiking season, sometimes badly.
- ✗The J-curve shoulder straps don't suit every chest shape; some switch to S-straps aftermarket.
Common Questions
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Related backpacks
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ULA Equipment
ULA Catalyst
The Catalyst is the Circuit's bigger sibling — 75 liters of total volume and a 40 lb rating for long food carries, winter kit, or bear-canister-plus-packraft loads. It's the UL pack for people whose trips outgrow the Circuit.
Weight
2.65 lbs
Capacity
75 L
Frame
Internal Frame
ULA Equipment
ULA Equipment Ultra Circuit
The Ultra Circuit is the Ultra-fabric version of ULA's best-known pack. It keeps the Circuit's carbon hoop and aluminium stay combination but rebuilds it in Ultra 400X and 200X, making it waterproof and considerably more tear-resistant than the standard Robic version.
Weight
2.24 lbs
Capacity
68 L
Frame
Internal Frame
ULA Equipment
ULA Equipment CDT
The CDT is the largest of ULA's frameless packs and the cheapest way into the brand. UltraGrid is a doubled 200D recycled grid fabric that resists tears well beyond its weight, and ULA states a clear 25 lb ceiling rather than leaving it to inference.
Weight
1.69 lbs
Capacity
50 L
Frame
Frameless
REI Co-op
REI Co-op Flash Air 50
The Flash Air is REI's ultralight pack, using a shaped spring steel frame rather than stays or a hoop. It is the only pack in this group backed by a mainstream retailer's return policy, which matters more than usual in a segment dominated by made-to-order cottage brands.
Weight
2.0 lbs
Capacity
50 L
Frame
Internal Frame
The Aircontact Ultra is Deuter's move into genuine ultralight territory: 1,270 g for a 55 L framed pack with a roll-top closure and a removable lid. It keeps the Aircontact name and Air Spacer mesh but swaps the aluminium Y-frame for a spring-steel round-profile perimeter frame, which is where most of the weight saving comes from.
Weight
2.8 lbs
Capacity
50+5 L
Frame
Internal Frame
Also in 40+5 L
The women's-fit Aircontact Ultra, at 1,210 g for 50 L. Between this and the 35+5 SL at 1,140 g, it is the lightest framed pack Deuter offers in a women's fit, and one of very few ultralight packs with a genuinely women's-specific carrying system rather than a short size of a unisex design.
Weight
2.67 lbs
Capacity
45+5 L
Frame
Internal Frame
Also in 35+5 L