Under Armour - Hustle 6.0 Backpack. Color Castlerock Full Heather/Black/Black. On sale for $42.61. MSRP $55.00.. +13Brand NameUnder ArmourProduct NameHustle 6.0 BackpackColorCastlerock Full Heather/Black/BlackPrice$42.61MSRP: $55.00Rating