stone glacier|SKU:89-50100-FG-S

Sky 5900 with Krux Frame — Carbon Fiber Stay System for Backcountry Loads

A Pack Built for the Long Haul in Serious Backcountry

Three volume configurations — Bivy, full, or max shelf capacity for any trip length
Carbon fiber stay system — Increased strength and reduced weight over prior frame designs
22-inch optics pocket — Fits the largest spotting scopes for quick access
Cordura and Xpac construction — Military-grade buckles and fabric built for abrasion resistance
Made in the USA — Backcountry-rated build with hydration system compatibility
  • Free Shipping -- Fully insured — signature required on orders over $500
  • Free Pre-Purchase Consult -- Talk to a technical expert on sizing and load configuration
  • Authorized Dealer Warranty -- Full manufacturer warranty honored — no gray market

$725.00

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Sky 5900 with Krux frame Kit
Sky 5900 with Krux frame Kit
$725.00

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In the box

  • Sky 5900 pack body
  • Krux frame system
Sky 5900 with Krux frame Kit
Sky 5900 with Krux Frame — Carbon Fiber Stay System for Backcountry Loads
$725.00

A Pack Built for the Long Haul in Serious Backcountry

The Sky 5900 with Krux frame delivers a season-proven carry system that adapts from bivy mode at 4,300 cubic inches to full volume at 5,900 — and exceeds 8,000 cubic inches with the added shelf. This rugged, made-in-USA pack uses Cordura 500 and Xpac fabric with a carbon fiber stay system for stability on steep, heavy loads. At 5 lb 8.8 oz on a Medium Xcurve, it is trail-ready without sacrificing durability or fast access to your glass.

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Made in USA
Carbon Fiber Stays
Cordura 500 & Xpac
Hydration Compatible
5,900 cu in
Full Volume Capacity
2 lb 6.72 oz
Weight Off Frame
22 inches
Front Pocket Height
Frame Integrity That Holds Under Real Pack-Out Stress

Frame Integrity That Holds Under Real Pack-Out Stress

The carbon fiber stay system in the Sky 5900 addresses the core failure point of most backcountry packs — frame flex under heavy loads after miles of rough terrain. Where lesser packs shift and deform on a 4-mile pack-out at 10,000 feet, the updated stay system maintains structural integrity under the kind of stress that bends aluminum stays and leaves you fighting your load instead of carrying it. Hunt Premium applies the same vetting standard here as with our optics: if it isn't gear that earns its spot in the backcountry, we don't stock it. Cordura 500 and Xpac construction with military-spec Duraflex buckles reinforce that standard.

One Pack That Covers Bivy Hunts Through Heavy Meat Hauls

One Pack That Covers Bivy Hunts Through Heavy Meat Hauls

From a 4,300-cubic-inch bivy setup for early-season spot-and-stalk to 5,900 cubic inches for a full base camp load-out, the Sky 5900 adapts to the hunt in front of you. Add the shelf and you exceed 8,000 cubic inches — enough capacity for a boned-out elk plus camp gear on a multi-day pack-out. The 22-inch front vertical pocket is sized to carry even the largest spotting scopes, keeping glass accessible without digging through the main compartment. Side pockets with top access hold a tripod or water bottle where you can reach them on the move. Swing Out Pocket attachment points inside the zipper keep small essentials accessible on trail without stopping.

Weight Savings That Compound Over a 10-Day Season

Weight Savings That Compound Over a 10-Day Season

At 5 lb 8.8 oz on a Medium frame, the Sky 5900 strips unnecessary weight without sacrificing load-carrying capability. Off the frame, the pack body alone drops to 2 lb 6.72 oz — useful when you are running light for a day hunt and want to leave the frame at camp. For a hunter covering serious vertical in a single day, that weight difference between a frameless day setup and a full load-out matters in ways that compound over a 10-day season. Hydration compatibility means you can run a bladder on early-season archery hunts without aftermarket rigging. Made in the USA with backcountry-rated construction and three belt sizes available — Small, Medium, and Large — to dial in fit before you hit the trailhead.

How This Pack Fits Your Hunt

Select your belt size and color to match your frame and terrain preferences.

  • Belt size options: Small, Medium, or Large
  • Color options: Foliage, Ranger, or Tan
  • Accepts Stone Glacier Sky Series Lid and Sky Top Compression Straps

Built for the Hunt That Demands More

From early-season bivy spikes to late-season heavy loads, the Sky 5900 adapts to how you hunt.

Backcountry Elk & Mule Deer
Spot-and-Stalk with Large Optics
Multi-Day Bivy Hunts
Packing Out Heavy Meat Loads

Full specifications

At a glance

Warranty
See product page
Full specifications12 data points across 4 categories

Dimensions

Bivy Mode Volume4,300 cubic inches
Full Volume5,900 cubic inches
Max Volume (with shelf)8,000 cubic inches plus
Front Pocket Height22 inches

Power & Performance

Weight on Medium Xcurve5 lb 8.8 oz
Weight Off Frame2 lb 6.72 oz
Hydration CompatibleYes

Materials

FabricCordura 500 and Xpac
Buckles1" Duraflex military approved
WebbingHeavy-duty

Compliance & Warranty

Country of ManufactureUSA
WarrantySee product page

The Hunt Premium Promise

We stand behind every product we sell — because gear that fails in the field doesn't earn a second chance.

Authorized Dealer WarrantyFull manufacturer warranty honored on every product. No gray market, no surprises.
Free ShippingShips free with fully insured delivery — signature required on orders over $500.
30-Day ReturnsUnmounted, in original packaging with caps on. Send it back if it doesn't meet your standards.

Stone Glacier’s Sky 5900 has been updated for 2019 with the all new carbon fiber stay system. If fit, feel, and stability are part of your criteria in a pack, the Stone Glacier Sky 5900 pack will meet your needs. When on a Medium Xcurve, Stone Glacier’s Sky 5900 weighs in at 5 lb 8.8 oz, off the frame is weighs in at 2 lb 6.72 oz. Whether you’re running in bivy-mode (4,300 cubic inches), full volume (5,900 cubic inches), or with the added shelf (max volume of 8,000 cubic inches plus) you will find this pack suits all your needs. A 22” front vertical pocket, sized to fit even the largest of optics, gives you quick access to your scope. Stone Glacier’s Sky 5900 has attachment points for Swing Out Pockets just inside the zipper. This enables you to gain access to small items you might need on the trail. There are large external pockets with top access on each side of the pack to conveniently carry a tripod, water bottle, or rifle stock.

The Stone Glacier Sky 5900 is made with Cordura 500 and Xpac fabric, heavy-duty 1” Duraflex military approved buckles and webbing, and is hydration compatible.

This made in the USA pack can be out fitted with the Stone Glacier Sky Series Lid, and Stone Glacier’s Sky Top Compression Straps.

FEATURES

  • NEW 2019 Carbon Fiber Stay System
  • Hydration compatible
  • Full panel zip for access to the main bag
  • Front zipped pocket for quick access to essentials
  • 150+ pound load rating (check Design page for load rating info)
  • Hydration compatible
  • 2,500+ cubic inch expandable load shelf
  • Belt attachments
  • Heavy duty YKK #10 zipper
  • Cordura 500 and Xpac fabric
  • Heavy-duty, 1″ Duraflex military approved buckles and webbing
  • Made in the USA

    SPECIFICATIONS

    Bivy Mode: 4,300 cubic inches
    Size with Lid: 5,900 cubic inches
    Size with Load Shelf: 8,000 cubic inches

    Weight: 5 lbs 8.8 oz (Medium); 2 lb 6.72 oz (Bag Only)

    Waist Size
    Small: 28″ – 30″
    Medium: 31″ – 36″
    Large: 37″ plus

    Xcurve Frame with Bag: $659
    Bag Only with Lid:
    $294

    NEW Carbon Fiber Stay System

    After years of research and development we have created the most advanced frame stay system yet. Increased strength, reduced weight, and added comfort are all improvements for 2019 to the already industry leading Xcurve Frame.

    The revolutionary Xcurve Frame combines pack frame comfort and lightweight durability like never before. The anatomically matched curvature of the frame conforms to your lower-back and torso for unmatched load-bearing comfort.

    Using 4 carbon fiber composite stays in an “X” configuration, the Xcurve incorporates curvature to match the lumbar and upper back contours for increased weight distribution and comfort under heavy load. The unique “X” stay configuration increases both vertical frame strength and eliminates any lateral shift, especially for loads over 100 pounds.

    The Powerlock hip belt has forward assist pull with locking features to eliminate any webbing slip, even under the heaviest of loads. The tighter the belt is adjusted, the tighter the lock on the webbing. The Powerlock hip belt also has adjustable upper and lower tensioners to cup the hips and equalize pressure for the full width of the belt, regardless of body shape. Dual density foam and improved belt shape all combine for more comfort under heavy loads.

    The Xcurve shoulder straps offer increased foam density for comfort, increased vertical torso adjustment for shorter torsos, and increased width adjustment to better match the curvature over the shoulders.  The Xcurve is compatible with all past and present SG bags and uses the same load shelf features and function that defines all Stone Glacier packs.

    The Xcurve was designed to provide the utmost comfort and stability under the heaviest of loads, a perfect blend of lightweight design and heavy load hauler. Xcurve frame weighs 3 lbs with Medium Belt.

    For additional instructional videos, such as how to use the Load Shelf or reattach the bag to the frame please see our instructions page.

    Additional information

    Color

    Foliage, Ranger, Tan

    Belt Size

    Large, Medium, Small

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    About stone glacier Hunting Gear

    stone glacier is a trusted manufacturer of premium hunting gear. HuntPremium is an authorized dealer offering the full stone glacier lineup with free delivery, price match guarantee, and expert support.

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