Gregory Mountain Men's Optic 48 Ultralight Backpack vs Gregory Mountain Men's Optic 55 Ultralight Backpack

The main difference between the Gregory Mountain Men's Optic 48 Ultralight Backpack and the Gregory Mountain Men's Optic 55 Ultralight Backpack is that the Men's Optic 48 Ultralight Backpack has Adjustable Length Torso (Yes) while the Men's Optic 55 Ultralight Backpack does not.

Gregory Mountain Products Men's Optic 48 Ultralight Backpack 1st Front View
Gregory Mountain Products Men's Optic 55 Ultralight Backpack Front View
Specs Brand Gregory Mountain Gregory Mountain
Name Men's Optic 48 Ultralight Backpack Men's Optic 55 Ultralight Backpack
Category Mens Mens
Sub Category Backpacking Backpacking
Capacity (L) 48L 55L
Dimensions (in) ‎26 x 14 x 4.5 23.5 x 12.6 x 4.2
Weight (lb) 2.4 2.4
Fabric Nylon Nylon
Color 2 colors and patterns 2 colors and patterns
Warranty The Gregory Limited Lifetime Warranty The Gregory Limited Lifetime Warranty
Release Date November 9, 2017 November 9, 2017
Rating 4.6 4.1
Price Under $250 Under $225
General Features Shoulder Straps Men's specific die-cut shoulder harness Padded shoulder straps
Sternum / Chest Straps Sternum strap Sternum and chest strap
Hip Belt / Waist Strap 3D comfort cradle hipbelt 3D comfort cradle hipbelt
Zippers ComfortGrip custom molded loop zipper pullers ComfortGrip custom molded loop zipper pullers
Main Compartment Access U-zip main opening or full body front access U-zip main opening or full body front access
External Pockets 3 external pockets including weather shield hip belt pocket 3 external pockets including weather shield hip belt pocket
Side Pockets Side pockets can hold water bottle Side pockets can hold water bottle
Water Bottle Yes Yes
Handles Top grab handle Top grab handle
Loops and Attachments Adjustable attachment loop and upper shock lock Adjustable attachment loop and upper shock lock
Travel Features Compression Straps External compression straps External compression straps
Rear Loading Straps Yes Yes
Hiking / Backpacking Features Back Panel Ventilated back panel Ventilated back panel
Rain Cover Yes Yes
Internal / External Frame Aluminum internal frame Aluminum internal frame
Ventilated Back Yes Yes
Adjustable Length Torso Yes
Hip Belt Pockets Yes Yes
Top / Floating Lid Yes Yes
Hydration Features Hydration Compatible Yes Yes

You're currently comparing the Men's Optic 48 Ultralight Backpack by Gregory Mountain against the Men's Optic 55 Ultralight Backpack by Gregory Mountain.


Gregory Mountain 's Men's Optic 48 Ultralight Backpack is a Mens backpack with Backpacking features while Gregory Mountain's Men's Optic 55 Ultralight Backpack is a Mens backpack with Backpacking features.

The Gregory Mountain Men's Optic 48 Ultralight Backpack has a capacity of 48L (liters), weighs 2.4 pounds and it's dimensions in inches are ‎26 x 14 x 4.5. It's made of Nylon and is available in 2 colors and patterns in comparison the Gregory Mountain Men's Optic 55 Ultralight Backpack's capacity is 55L with a size of 23.5 x 12.6 x 4.2 inches. Constructed from Nylon it weighs 2.4 pounds and is available in 2 colors and patterns.