Under Armour - Hustle 6.0 Backpack. Color Castlerock Full Heather/Black/Black. On sale for $40.81. MSRP $55.00.. +9Brand NameUnder ArmourProduct NameHustle 6.0 BackpackColorCastlerock Full Heather/Black/BlackPrice$40.81MSRP: $55.00Rating