Under Armour Project Rock Backpack vs Under Armour Flex Sling Bag

The main difference between the Under Armour Project Rock Backpack and the Under Armour Flex Sling Bag is that the Project Rock Backpack has Sternum / Chest Straps (Adjustable sternum strap) while the Flex Sling Bag does not.

Under Armour Project Rock Backpack Front View
Under Armour Flex Sling Bag Front View
Specs Brand Under Armour Under Armour
Name Project Rock Backpack Flex Sling Bag
Category Laptop Sling
Sub Category Travel Mens
Capacity (L) 28.5L 15L
Dimensions (in) 11 x 7.5 x 19 10.9 x 4.3 x 17.3
Weight (lb) 2.5 0.7
Fabric 100% Polyester 100% Polyester
Color Graphite/Black 2 colors and patterns
Warranty Under Armour 60 Days Return Policy Under Armour 60 Days Return Policy
Release Date ‎May 7, 2019
Rating 4.9 4.2
Price Under $100 Under $50
General Features Shoulder Straps Adjustable padded HeatGear® shoulder straps Adjustable cross-body strap
Sternum / Chest Straps Adjustable sternum strap
Water Proof / Water Resistant UA Storm technology water resistant finish
Main Compartment Access Normal zipped access Top access with cinch closure
External Pockets 3 front, 1 back and 3 side pockets 1 front and 2 side pockets
Side Pockets Side pockets can fit water bottle and other accessories Side pockets can fit water bottle
Water Bottle Yes Yes
Handles Top grab handle
Lightweight Yes
Business & School Features Laptop Sleeve TSA friendly laptop sleeve fits up to 15"
Tablet Sleeve Soft lined padded tablet sleeve
Travel Features Base / Bottom Tough, abrasion-resistant PU coated bottom panel
Gym / Sports Features Shoe Compartment Stretch shoe pocket on front panel with buckle closure fits pair of shoes

You're currently comparing the Project Rock Backpack by Under Armour against the Flex Sling Bag by Under Armour .


Under Armour 's Project Rock Backpack is a Laptop backpack with Travel features while Under Armour 's Flex Sling Bag is a Sling backpack with Mens features.

The Under Armour Project Rock Backpack has a capacity of 28.5L (liters), weighs 2.5 pounds and it's dimensions in inches are 11 x 7.5 x 19. It's made of 100% Polyester and is available in Graphite/Black in comparison the Under Armour Flex Sling Bag's capacity is 15L with a size of 10.9 x 4.3 x 17.3 inches. Constructed from 100% Polyester it weighs 0.7 pounds and is available in 2 colors and patterns.