Under Armour - Hustle 6.0 Backpack. Color Castlerock Full Heather/Black/Black. On sale for $41.15. MSRP $55.00.. +8Brand NameUnder ArmourProduct NameHustle 6.0 BackpackColorCastlerock Full Heather/Black/BlackPrice$41.15MSRP: $55.00Rating