Under Armour - Hustle 6.0 Pro Backpack. Color Black/Black/Castlerock. Low Stock. On sale for $45.50. MSRP $65.00.. Add to favorites. 0 people have favorited thisLow Stock+2Brand NameUnder ArmourProduct NameHustle 6.0 Pro BackpackColorBlack/Black/CastlerockPrice$45.50MSRP: $65.00Rating