Exo Mtn Gear K4 5000 vs Kuiu ICON 6 6000
Quick take: The Kuiu ICON 6 6000 costs $1 less; the Kuiu ICON 6 6000 carries more (98 vs 93 liters); the Exo Mtn Gear K4 5000 is lighter (5.8 vs 6.15 lbs).
| Spec | Exo Mtn Gear K4 5000 | Kuiu ICON 6 6000 |
|---|---|---|
| Price | $700 | $699 |
| Rating | 4.9★ (529) | 4.7★ (7) |
| Type | Hunting Pack | Hunting Pack |
| Frame Type | External Frame | External Frame |
| Capacity | 93 L | 98 L |
| Weight | 5.8 lbs | 6.15 lbs |
| Max Load | 150+ lbs | 150 lbs |
| Torso Fit | 4 frame heights (22–26.5 in) with adjustable harness, 5 hipbelt sizes XS–XL | 3 suspension sizes (S/M, L/XL, XXL/3XL); Regular frame fits 5'2"-5'9", Tall fits 5'10"-6'6" |
| Material | MIL-SPEC 500D CORDURA with YKK zippers; built in Boise, Idaho | 330D double ripstop CORDURA nylon with waterproof-coated CORDURA main compartment |
| Back Panel | K4 carbon-fiber-stay frame with integrated load compression and flap-style load shelf | Patent-pending 3D corrugated thermoplastic carbon fiber frame (made in USA) with Flex-Forward geometry, breathable spacer air mesh and dual-density foam shoulder straps |
| Adjustable torso | Yes | Yes |
| Ventilated back | No | Yes |
| Raincover included | No | No |
| Hipbelt pockets | No | Yes |
| Removable lid | Yes | Yes |
| Hydration sleeve | Yes | Yes |
| Fits BV500 bear can | Yes | Yes |
| Warranty | Lifetime guarantee against defects, plus 30-day trial period | Lifetime warranty against manufacturing defects |
Pros & cons
Exo Mtn Gear K4 5000
- ✓Rokslide's multi-tester review called the K4 'the most comfortable pack tested' against the industry's best, crediting the custom carbon-stay frame and redesigned harness.
- ✓Fit options lead the category — four frame heights (22–26.5 in) and five hipbelt sizes (XS–XL), backed by a 30-day trial, versus pick-a-curve guesswork with Stone Glacier's Krux/Xcurve.
- ✓Organization is the K4's calling card: horseshoe zip into the main bag, stretch front panel, full-length zippered side pockets, and laser-cut MOLLE — owners say it's the easiest flagship pack to live out of.
- ✓The flap-style load shelf deploys without pulling the bag off the frame, making day-pack-to-meat-hauler transitions faster than Stone Glacier's unbuckle-everything approach.
- ✓The included lid adds ~650 ci and the price includes the complete system — no a-la-carte lid or frame math like Kifaru builds.
- ✓A dedicated hydration compartment with a drain grommet keeps a leaky bladder from soaking your sleep insulation, a detail forum users repeatedly call out.
- ✓Owners rate it 4.9 stars across 529 reviews on Exo's site (98% five-star), and the Boise-based customer service earns Rokslide praise rivaling Mystery Ranch's.
- ✓Integrated bow and rifle carry work stock, and treadmill-style testing threads report no harness slippage running uphill with 30+ lb loads.
- ✗The bag tapers narrow at the bottom — Rokslide users report bulky sleeping bags like a Western Mountaineering Kodiak in its stuff sack fight to fit.
- ✗Several owners in the long-running K4 thread report harness or hipbelt slippage once loads pass roughly 60 lbs, requiring re-tensioning on pack-outs.
- ✗Side pockets use a single zipper that interferes with the lid when it's fitted — a two-zip design is a common owner wish.
- ✗Bow Spider users note the mount's metal clips don't line up with the K4 hipbelt MOLLE spacing, forcing workarounds for a popular accessory.
- ✗Hipbelt pockets aren't included — the MOLLE belt is bare until you buy Exo's add-on pouches, unlike some competitors' stock belt storage.
- ✗At 5 lb 13 oz complete with lid, it's the heaviest of the big-three frame systems — about 0.3 lb over a Sky 5900 and half a pound over a Metcalf 75.
- ✗The lighter K4X update (about 1 lb savings in prototypes) has limited release in summer 2026 with full launch in 2027, so buyers today are getting last-generation materials.
- ✗Exo sells essentially direct-only, so outside the 30-day trial there's no trying one on in a store the way Scheels stocks Stone Glacier and Mystery Ranch.
Kuiu ICON 6 6000
- ✓At 6 lb 2.4 oz for the complete 98 L kit, it undercuts comparable Kifaru and Mystery Ranch expedition haulers by a pound or more while keeping a genuine load-hauling frame.
- ✓The 3D corrugated thermoplastic carbon frame is engineered to yield rather than shatter — a direct answer to the cracked carbon frames Rokslide users reported on the old Pro system.
- ✓Load-sling mode opens roughly 5,000 cubic inches between bag and frame for quarters, and the Pack Load Hauler doubles as a glassing pad for direct on-frame meat hauls.
- ✓$699 buys the entire kit — frame, bag, two hip belts, load sling, rifle quick release and gear strap — while Rokslide posters note comparable Exo K4 and Stone Glacier builds push north of $800.
- ✓The horseshoe zipper across the back panel lets a rifle or a whole elk quarter slide down against the frame without unloading the bag, a feature early reviewers single out.
- ✓An internal waterproof-coated drop pocket carries up to 45 lbs of boned-out meat high and tight against the frame, keeping the weight where the suspension can handle it.
- ✓Hook & Barrel's tester found the suspension 'began to distinguish itself around the 80-pound mark' with zero frame creak or squeak — a common gripe on older Kuiu carbon frames.
- ✓Nearly five inches of half-inch-increment shoulder adjustment plus Regular and Tall frame heights covers hunters from 5'2" to 6'6", with a dedicated women's version.
- ✗Zero backward compatibility — Kuiu states the ICON 6 'shares zero key components' with the Pro/Pro LT systems, so existing Kuiu bag owners must rebuy everything, a sore point on Rokslide.
- ✗Kuiu pack skepticism runs deep on Rokslide — veteran posters still say the frames aren't at Stone Glacier or Kifaru level for comfort under loose meat and heavy quarters.
- ✗It's a brand-new 2025 system with essentially no multi-season durability record, versus the proven Exo K4 and Stone Glacier Xcurve platforms it competes with.
- ✗Kuiu's 'Regular' frame sizing historically runs short — forum users warn hunters around 5'9" and up end up with weight stuck on their shoulders unless they size up to Tall.
- ✗Tall frame variants were sold out in every suspension size at the time of research, so long-torso hunters may face a wait.
- ✗Only 7 verified reviews existed on Kuiu's site as of mid-2026, so crowd-sourced validation is thin compared to packs with hundreds of reviews.
- ✗No rain cover is included; the uncoated weight-saving panels and unsealed seams mean a soaked pack in sustained downpours without a liner.
- ✗At $699 the kit costs $100 more than the outgoing Pro 6000, and it's over twice the weight of ultralight crossover haulers like Seek Outside's Divide if you don't need the full 98 L.