Gregory Mountain Men's Optic 55 Ultralight Backpack vs Osprey Atmos AG 50 Mens Backpacking Backpack

The main difference between the Gregory Mountain Men's Optic 55 Ultralight Backpack and the Osprey Atmos AG 50 Mens Backpacking Backpack is that the Men's Optic 55 Ultralight Backpack has Zippers (ComfortGrip custom molded loop zipper pullers) while the Atmos AG 50 Mens Backpacking Backpack does not.

Gregory Mountain Products Men's Optic 55 Ultralight Backpack Front View
Osprey Atmos AG 50 Mens Backpacking Backpack Front View
Specs Brand Gregory Mountain Osprey
Name Men's Optic 55 Ultralight Backpack Atmos AG 50 Mens Backpacking Backpack
Category Mens Mens
Sub Category Backpacking Backpacking
Capacity (L) 55L 50L
Dimensions (in) 23.5 x 12.6 x 4.2 32.68 x 14.96 x 15.35
Weight (lb) 2.4 4.2
Fabric Nylon 100D X 630D Nylon Dobby
Color 2 colors and patterns 3 colors and patterns
Warranty The Gregory Limited Lifetime Warranty Osprey Lifetime Warranty
Release Date November 9, 2017 August 15, 2015
Rating 4.1 4.7
Price Under $225 Under $250
General Features Shoulder Straps Padded shoulder straps Adjustable shoulder straps
Sternum / Chest Straps Sternum and chest strap Sternum strap with integrated safety whistle
Hip Belt / Waist Strap 3D comfort cradle hipbelt Fit-on-the-Fly hipbelt with pockets
Zippers ComfortGrip custom molded loop zipper pullers
Main Compartment Access U-zip main opening or full body front access Top loading access
External Pockets 3 external pockets including weather shield hip belt pocket Front stretch mesh pocket and 2 stretch mesh side pockets
Side Pockets Side pockets can hold water bottle Side pockets can fit water bottle
Water Bottle Yes Yes
Handles Top grab handle Top grab handle
Loops and Attachments Adjustable attachment loop and upper shock lock Web attachment points, dual ice tool loops, Stow-on-the-Go trekking pole attachment, integrated FlapJacket
Travel Features Compression Straps External compression straps External compression straps
Stowable Straps Removable sleeping pad straps
Rear Loading Straps Yes
Hiking / Backpacking Features Back Panel Ventilated back panel Innovative AntiGravity suspension
Rain Cover Yes
Internal / External Frame Aluminum internal frame LightWire-tensioned, full peripheral frame comfortably transfers pack load
Ventilated Back Yes Yes
Hip Belt Pockets Yes Yes
Top / Floating Lid Yes Yes
Trekking Pole Holders Yes
Hydration Features Bladder Size Holds 3L hydration reservoir
Hydration Compatible Yes Yes

You're currently comparing the Men's Optic 55 Ultralight Backpack by Gregory Mountain against the Atmos AG 50 Mens Backpacking Backpack by Osprey .


Gregory Mountain's Men's Optic 55 Ultralight Backpack is a Mens backpack with Backpacking features while Osprey 's Atmos AG 50 Mens Backpacking Backpack is a Mens backpack with Backpacking features.

The Gregory Mountain Men's Optic 55 Ultralight Backpack has a capacity of 55L (liters), weighs 2.4 pounds and it's dimensions in inches are 23.5 x 12.6 x 4.2 . It's made of Nylon and is available in 2 colors and patterns in comparison the Osprey Atmos AG 50 Mens Backpacking Backpack's capacity is 50L with a size of 32.68 x 14.96 x 15.35 inches. Constructed from 100D X 630D Nylon Dobby it weighs 4.2 pounds and is available in 3 colors and patterns.