Stone Glacier - Sky 5900 Pack (50057)

The Sky 5900 combines the functionality of a front panel zip with the proven versatility of the Sky design, making it a reliable companion from day trips to extended excursions. Weighing 5 lb 8.8 oz on a Medium Xcurve Frame, this pack transitions seamlessly from a 4,300 cubic inch bivy mode to a spacious 5,900 cubic inch main bag, expandable to 8,000 cubic inches with the addition of the Sky Lid and load shelf.

Key features include a large front panel zip for easy access to the entire pack, excellent compression capabilities inherent to the Sky design, and a 2,500+ cubic inch expandable load shelf. A 22" front vertical pocket accommodates spotting scopes, with attachment points inside for Swing Out Pockets and large external open-top pockets on each side for tripods, water bottles, or rifle stocks.

SPECS

• Weight: 5 lb 8.8 oz (Medium Xcurve Frame); Bag only: 2 lb 6.72 oz
• Capacity:
  • 5,900 cubic inch main bag
  • 4,300 cubic inch bivy-mode
• Hydration compatible
• Full panel zip for easy access
• Front zipped pocket for quick essentials access
• 150+ pound load rating
• Belt attachments
• Heavy duty YKK #10 zipper
• Fabric: Cordura 500 and Xpac
• Heavy-duty, 1" Duraflex military approved buckles and webbing
• Made in the USA

Stone Glacier XCurve Frame

The Xcurve frame represents the pinnacle of Stone Glacier's evolution for heavy loads. Featuring 4 carbon fiber/titanium composite stays in an "X" configuration, the frame's curvature matches lumbar and upper back contours for superior weight distribution and comfort under heavy loads. The "X" stay configuration enhances vertical frame strength and eliminates lateral shift, crucial for loads exceeding 100 pounds.

The Powerlock hip belt ensures a secure fit with forward assist pull and locking features to prevent webbing slip. Adjustable upper and lower tensioners customize fit and evenly distribute pressure across the hips. Dual density foam and an improved belt shape enhance comfort under heavy loads.

Xcurve shoulder straps offer increased foam density, vertical torso adjustment, and width adjustment for optimal shoulder fit. Compatible with all past and present Stone Glacier bags, the Xcurve includes integrated load shelf features for seamless functionality.

SPECS

• Weight: 3 lb 2 oz with medium belt
• Frame height: 26 inches
• Fabric: Cordura 500d and X-Pac
• Stays: Carbon composite & crimped aerograde titanium tubing (4 total)
• Integrated load-shelf
• Heavy-duty, 1" Duraflex military approved buckles and webbing
• 150+ pound load rating
• Can be used as a pack frame for load hauling without any bag attached
• Made in the USA

WAIST BELT SIZES

• Small: 28" - 30"
• Medium: 31" - 36"
• Large: 37" +