ULA Catalyst vs ULA Equipment Ultra Circuit SV
Quick take: The ULA Catalyst costs $60 less; the ULA Catalyst carries more (75 vs 48 liters); the ULA Equipment Ultra Circuit SV is lighter (2.2 vs 2.78 lbs).
Which one to buy
These two ULA packs sit at opposite ends of the lineup, and the cheaper one is the bigger one. The Catalyst costs $60 less, holds 75 L against 48 L, and is rated at 40 lb against 35 lb. The Ultra Circuit SV's extra money goes into ULTRA 400X and 200X fabric, which sheds water better than Robic and absorbs less, and a lighter build at 2.2 lbs.
The Catalyst is built for big loads. Its dual stays and hoop keep the 40 lb rating honest, with desert hikers carrying 8 liters of water without collapse, and a BV500 fits horizontally with about 10 days of food around it. Buyers who don't need the volume usually end up wishing they'd bought the Circuit: the collar gets floppy when underfilled, and the foam back has zero ventilation.
The Ultra Circuit SV is for hikers whose kit is already small. At 48 L with a 35 lb ceiling, it suits a full thru-hike resupply with a compact base weight, and the roll-top keeps things simple. Rain is the main argument for paying more, since ULTRA fabric stays drier than Robic. Both come in four fixed torso sizes from 15 in to 24+ in, so measure before ordering, and both carry ULA's lifetime warranty.
ULA Catalyst
For long food carries, winter kit and canister trips that need 75 L and a 40 lb frame, for $60 less.
ULA Equipment Ultra Circuit SV
Worth the extra if your kit fits 48 L, stays under 35 lb, and you hike in wet weather where ULTRA fabric earns its keep.
| Spec | ULA Catalyst | ULA Equipment Ultra Circuit SV |
|---|---|---|
| Price | $319.99 | $379.99 |
| Rating | — | — |
| Type | Ultralight Pack | Ultralight Pack |
| Frame Type | Internal Frame | Internal Frame |
| Capacity | 75 L | 48 L |
| Weight | 2.78 lbs | 2.2 lbs |
| Max Load | 40 lbs | 35 lbs |
| Torso Fit | S 15-18 in, M 18-21 in, L 21-24 in, XL 24+ in | Sized S/M/L/XL (S 15-18, M 18-21, L 21-24, XL 24+ in) |
| Material | ULA 400 Robic nylon | ULTRA 400X and ULTRA 200X |
| Back Panel | Foam panel with carbon-fiberglass hoop and dual stays | Internal suspension hoop |
| Adjustable torso | No | No |
| Ventilated back | No | No |
| Raincover included | No | No |
| Hipbelt pockets | Yes | No |
| Removable lid | No | No |
| Hydration sleeve | Yes | No |
| Fits BV500 bear can | Yes | No |
| Warranty | ULA lifetime warranty: original owner, defects in materials and workmanship (wear, accidents and misuse excluded) | ULA lifetime warranty |
Pros & cons
ULA Catalyst
- ✓The go-to answer when ultralight hikers ask 'what if I need more than a Circuit' — same DNA, more capacity, 5 lb higher rating.
- ✓Dual aluminum stays plus the hoop make its 40 lb rating honest; desert hikers carry 8L of water without collapse.
- ✓75 liters swallows a BV500 horizontally plus 10 days of food — the specific use case owners buy it for.
- ✓The same 400d Robic bombproof reputation as the Circuit, with thousands-of-miles reports common.
- ✓Massive front mesh and hipbelt pockets keep a full day's needs outside the main bag.
- ✓Hand-made in Utah, easily repairable, backed by ULA's excellent service.
- ✓About 6 ounces heavier than the Circuit for 7 more liters and a stiffer frame.
- ✓Strong resale on trade forums, like everything ULA.
- ✗Overkill for standard three-season loads — most buyers who don't need the volume end up wishing they'd bought the Circuit.
- ✗Same zero-ventilation foam back as the Circuit; sweat is the tax.
- ✗Fixed torso sizes with direct-order-only sizing risk.
- ✗At 2.78 lbs it's approaching crossover packs with plusher harnesses.
- ✗The big collar is floppy when underfilled, so partial loads need diligent compression.
- ✗No lid, no internal organization — the usual ULA minimalism.
- ✗Seasonal lead times can be long.
- ✗The look is pure function; nobody buys a Catalyst for style.
ULA Equipment Ultra Circuit SV
- ✓ULTRA fabric sheds water better than Robic and absorbs less.
- ✓Saves 1.7 oz over the Robic Circuit SV.
- ✓35 lb ceiling suits a full thru-hike resupply.
- ✓Four torso sizes.
- ✓Roll-top closure.
- ✗$379.99 is an $80 premium over the Robic SV for a small weight saving.
- ✗Torso length is fixed within each size.
- ✗Same price band as Zpacks and HMG laminate packs that weigh less.
ULA Catalyst vs ULA Equipment Ultra Circuit SV: common questions
Why would I pay $60 more for a smaller ULA pack?▾
For the fabric and the weight. The Ultra Circuit SV uses ULTRA 400X and 200X, which sheds water better than Robic and absorbs less, and it weighs 2.2 lbs. If your kit doesn't need 75 L, you're paying for a drier, lighter bag.
Can the Ultra Circuit SV carry a bear canister and a week of food like the Catalyst?▾
It isn't built around one, and at 48 L the room is tight. In the Catalyst a BV500 rides horizontally with about 10 days of food around it, which is the use case owners buy it for.