Gregory Mountain Men's Optic 55 Ultralight Backpack vs Gregory Mountain Nano 20 Backpack

The main difference between the Gregory Mountain Men's Optic 55 Ultralight Backpack and the Gregory Mountain Nano 20 Backpack is that the Men's Optic 55 Ultralight Backpack has Zippers (ComfortGrip custom molded loop zipper pullers) while the Nano 20 Backpack does not.

Gregory Mountain Products Men's Optic 55 Ultralight Backpack Front View
Gregory Mountain Products Nano 20 Everyday Outdoor Backpack 1st Front View
Specs Brand Gregory Mountain Gregory Mountain
Name Men's Optic 55 Ultralight Backpack Nano 20 Backpack
Category Mens Backpacking
Sub Category Backpacking Hiking
Capacity (L) 55L 20L
Dimensions (in) 23.5 x 12.6 x 4.2 19.2 x 1.7 x 1
Weight (lb) 2.4 1.5
Fabric Nylon Nylon
Color 2 colors and patterns Obsidian Black
Warranty The Gregory Limited Lifetime Warranty The Gregory Limited Lifetime Warranty
Release Date November 9, 2017
Rating 4.1 4.0
Price Under $225 Under $75
General Features Shoulder Straps Padded shoulder straps Air mesh padded shoulder straps
Sternum / Chest Straps Sternum and chest strap Sternum strap
Hip Belt / Waist Strap 3D comfort cradle hipbelt Removable hip belt
Zippers ComfortGrip custom molded loop zipper pullers
Main Compartment Access U-zip main opening or full body front access Normal zipped access
External Pockets 3 external pockets including weather shield hip belt pocket 1 zipped front pocket and 2 side pockets
Side Pockets Side pockets can hold water bottle Side pockets can fit water bottle and other accessories
Water Bottle Yes Yes
Handles Top grab handle Top grab handle
Loops and Attachments Adjustable attachment loop and upper shock lock
Business & School Features Tablet Sleeve Tablet sleeve fits up to 10”
Travel Features Compression Straps External compression straps
Rear Loading Straps Yes
Hiking / Backpacking Features Back Panel Ventilated back panel Breathable back panel
Rain Cover Yes
Internal / External Frame Aluminum internal frame
Ventilated Back Yes
Hip Belt Pockets Yes
Top / Floating Lid Yes
Hydration Features Hydration Compatible Yes Yes

You're currently comparing the Men's Optic 55 Ultralight Backpack by Gregory Mountain against the Nano 20 Backpack by Gregory Mountain .


Gregory Mountain's Men's Optic 55 Ultralight Backpack is a Mens backpack with Backpacking features while Gregory Mountain 's Nano 20 Backpack is a Backpacking backpack with Hiking 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 Gregory Mountain Nano 20 Backpack's capacity is 20L with a size of 19.2 x 1.7 x 1 inches. Constructed from Nylon it weighs 1.5 pounds and is available in Obsidian Black.