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Gregory - Octal 45

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Gregory - Octal 45
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Check out our Guide to Selecting a Gregory Pack for even more insight. 


Availability: In stock

Stock #: H37H-

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An ultralight pack with proper support and essential features that provides a better experience—more efficient and much more enjoyable—than a hyper-minimalist stuff sack with zero structure. The difference shows the morning after a 15-mile day, when the Octal 45 proves that comfort is one trail essential you can’t live without.


• AeroSpan suspension with EVAP moisture wicking shallow-depth ventilated back panel
• Ventilated, dual-density FocusForm shoulder harness and extra supportive hip belts with targeted comfort zones
• Leaf-Spring Lumbar pad for comfortable, energy-saving load transfer
• Ultra-light 7001 aluminum perimeter frame with Anti-barreling support
• Included custom fitted rain cover stows in the top pocket for quick access in unexpected showers
• Removable top zippered pocket to shed ounces and swap-in included ultra-light weather flap to stay protected (stows in top pocket)
• Sunglass QuickStow system on shoulder harness for quick, secure and scratch-free access to your shades without taking the pack off 
• Quick access on-the-go water bottle stow access on both the right and left sides
• Over sized, durable front stretch mesh pocket for quick access organization
• Dual zippered hip belt pockets provide secure, easy to access storage 
• Dual stretch mesh side pockets with Large capacity for bottles, camp sandals, trekking poles 
• Dual adjustable attachment loops and upper shock locks for trekking poles or ice axes
• Ultra-light V-Compression system on side and bottom of bags
• Lower side compression pass-through on side pocket for over/under option
• Gear attachment points on top pocket and main body


  • Frame Type: Internal Frame
  • Ultralight: Yes
  • Gear Capacity (L): XS: 42 liters, S: 45 liters, M: 48 liters
  • Gear Capacity (cu. in.): XS: 2,563 cubic inches, S: 2,746 cubic inches, M: 2,929 cubic inches
  • Weight: XS: 2.3 pounds, S: 2.4 pounds, M: 2.5 pounds
  • Fits Torso: XS: 14-16 inches, S: 16-18 inches, M: 18-20 inches
  • Fits Waist/Hips: XS: 26-45 inches, S: 27-46 inches, M: 28-48 inches
  • Material(s) Body: 100-denier/210-denier HD tenacity nylon; lining: 135-denier HD polyester
  • Frame Material: Aluminum
  • Number of Stays: Perimeter wire
  • Hydration Compatible: Yes
  • Pack Access: Top
  • Number of Exterior Pockets: 3 + main compartment
  • Raincover Included: Yes
  • Hipbelt Pockets: Yes
  • Dimensions: XS: 24 x 12.5 x 10 inches, S: 26 x 12.5 x 10.5 inches, M: 28 x 12.5 x 11.5 inches

Additional Information

Intended Use Hiking/Backpacking
Collection New Arrivals

Product Videos

  • Gregory Octal Pack