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

The main difference between the Gregory Mountain Nano 20 Backpack and the Gregory Mountain Men's Optic 55 Ultralight Backpack is that the Nano 20 Backpack has Tablet Sleeve (Tablet sleeve fits up to 10”) while the Men's Optic 55 Ultralight Backpack does not.

Gregory Mountain Products Nano 20 Everyday Outdoor Backpack 1st Front View
Gregory Mountain Products Men's Optic 55 Ultralight Backpack Front View
Specs Brand Gregory Mountain Gregory Mountain
Name Nano 20 Backpack Men's Optic 55 Ultralight Backpack
Category Backpacking Mens
Sub Category Hiking Backpacking
Capacity (L) 20L 55L
Dimensions (in) 19.2 x 1.7 x 1 23.5 x 12.6 x 4.2
Weight (lb) 1.5 2.4
Fabric Nylon Nylon
Color Obsidian Black 2 colors and patterns
Warranty The Gregory Limited Lifetime Warranty The Gregory Limited Lifetime Warranty
Release Date November 9, 2017
Rating 4.0 4.1
Price Under $75 Under $225
General Features Shoulder Straps Air mesh padded shoulder straps Padded shoulder straps
Sternum / Chest Straps Sternum strap Sternum and chest strap
Hip Belt / Waist Strap Removable hip belt 3D comfort cradle hipbelt
Zippers ComfortGrip custom molded loop zipper pullers
Main Compartment Access Normal zipped access U-zip main opening or full body front access
External Pockets 1 zipped front pocket and 2 side pockets 3 external pockets including weather shield hip belt pocket
Side Pockets Side pockets can fit water bottle and other accessories 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
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 Breathable back panel Ventilated 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 Nano 20 Backpack by Gregory Mountain against the Men's Optic 55 Ultralight Backpack by Gregory Mountain.


Gregory Mountain 's Nano 20 Backpack is a Backpacking backpack with Hiking features while Gregory Mountain's Men's Optic 55 Ultralight Backpack is a Mens backpack with Backpacking features.

The Gregory Mountain Nano 20 Backpack has a capacity of 20L (liters), weighs 1.5 pounds and it's dimensions in inches are 19.2 x 1.7 x 1. It's made of Nylon and is available in Obsidian Black 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.