Under Armour - Hustle 6.0 Backpack. Color Castlerock Full Heather/Black/Black. On sale for $45.10. MSRP $55.00.. +15Brand NameUnder ArmourProduct NameHustle 6.0 BackpackColorCastlerock Full Heather/Black/BlackPrice$45.10MSRP: $55.00Rating